Update actions/cache action to v4 (#1271)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/pull-request.yml

@@ -52,13 +52,13 @@ jobs:
       # A hack as GH action does not allow you to force override cache storing if there was a cache hit
       # https://github.com/actions/cache/issues/628#issuecomment-986118455
       - name: 🗄️ Force Save Registry Cache Per Sha
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/registry
           key: ${{ runner.os }}-pull-request-cache-${{ github.sha }}
 
       - name: 🗄️ Restore Registry Cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/registry
           key: ${{ runner.os }}-pull-request-cache-${{ github.sha }}