⬆️ Bump actions/checkout from 3 to 4

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
       - name: Checkout
         id: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Update system packages
         id: prepare

.github/workflows/ci-conda.yml

@@ -49,7 +49,7 @@ jobs:
         conda-env: [environment]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Check for Miniconda
         id: check_conda

.github/workflows/ci-linux-incremental.yml

@@ -43,7 +43,7 @@ jobs:
       uninstall_targets: ${{ steps.build-targets.outputs.uninstall_targets }}
       build_targets:     ${{ steps.build-targets.outputs.build_targets }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get all packages that have changed
         id: changed-packages
         uses: tj-actions/changed-files@v38

.github/workflows/ci-macos.yml

@@ -47,7 +47,7 @@ jobs:
       LOCAL_ARTIFACT_NAME: sage-local-commit-${{ github.sha }}-tox-local-${{ matrix.tox_env }}-${{ matrix.os }}-xcode_${{ matrix.xcode_version_factor }}
       LOGS_ARTIFACT_NAME: logs-commit-${{ github.sha }}-tox-local-${{ matrix.tox_env }}--${{ matrix.os }}-xcode_${{ matrix.xcode_version_factor }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Select Xcode version
         run: |
           if [ ${{ matrix.xcode_version_factor }} != default ]; then sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode_version_factor }}.app; fi
@@ -118,7 +118,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 500
       - name: fetch tags
@@ -160,7 +160,7 @@ jobs:
       TOX_ENV: local-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}
       LOGS_ARTIFACT_NAME: logs-commit-${{ github.sha }}-tox-local-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}-xcode_${{ matrix.xcode_version_factor }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         if: "!contains(matrix.tox_system_factor, 'nobootstrap')"
       - uses: actions/download-artifact@v3
         with:

.github/workflows/ci-wsl.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - name: Configure git
       run: git config --global core.symlinks true
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Ubuntu 20.04 (in WSL)
       run: |
         (New-Object System.Net.WebClient).DownloadFile("https://aka.ms/wslubuntu2004", "Ubuntu.appx")

.github/workflows/cygwin.yml

@@ -73,14 +73,14 @@ jobs:
         choco install git python39 python39-pip --source cygwin
 
     - name: Check out SageMath
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: ${{ inputs.sage_repo }}
         ref: ${{ inputs.sage_ref }}
         fetch-depth: 2000
 
     - name: Check out git-trac-command
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: sagemath/git-trac-command
         path: git-trac-command

.github/workflows/dist.yml

@@ -32,7 +32,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install bootstrap prerequisites
         run: |
           sudo DEBIAN_FRONTEND=noninteractive apt-get update
@@ -51,7 +51,7 @@ jobs:
     env:
       CAN_DEPLOY: ${{ secrets.SAGEMATH_PYPI_API_TOKEN != '' }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install bootstrap prerequisites
         run: |
           sudo DEBIAN_FRONTEND=noninteractive apt-get update
@@ -106,7 +106,7 @@ jobs:
       # Use 'build', not 'pip wheel'
       CIBW_BUILD_FRONTEND: build
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v3
         with:

.github/workflows/doc-build-pdf.yml

@@ -19,7 +19,7 @@ jobs:
     container: ghcr.io/sagemath/sage/sage-docker-fedora-31-maximal-with-targets:dev
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Prepare
         run: |

.github/workflows/doc-build.yml

@@ -17,7 +17,7 @@ jobs:
     container: ghcr.io/sagemath/sage/sage-ubuntu-focal-standard-with-targets:dev
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Update system packages
         run: |

.github/workflows/docker.yml

@@ -146,7 +146,7 @@ jobs:
       EXTRA_SAGE_PACKAGES:  ${{ inputs.extra_sage_packages }}
     steps:
       - name: Check out SageMath
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ${{ inputs.sage_repo }}
           ref: ${{ inputs.sage_ref }}

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:

.github/workflows/push_to_docker_hub.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set tag
         # docker/metadata-action@v4 is not used since we need to distinguish
@@ -76,7 +76,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set tag
         # docker/metadata-action@v4 is not used since we need to distinguish