Bump checkout action

.github/workflows/php.yml

@@ -278,9 +278,9 @@ jobs:
     runs-on: [ubuntu-latest]
     needs: [unit-tests-linux]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: coverage-data
           path: ${{ github.workspace }}/build