build(deps): bump actions/checkout from 3.5.3 to 3.6.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.3 to 3.6.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@c85c95e...f43a0e5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/check-upstream-ed25519.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out repository
-      uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
     - name: Test if ed25519 upstream main HEAD is what we expect
       id: test_ed25519
       run: |

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout securesystemslib
-        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1

.github/workflows/test-kms.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout securesystemslib
-        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Set up Python
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1

.github/workflows/test-sigstore.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout securesystemslib
-        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
 
       - name: Set up Python
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1