Bump github actions tools

.github/workflows/diagnostics.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Pull source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP with PECL extension
         uses: shivammathur/setup-php@v2
@@ -38,7 +38,7 @@ jobs:
           coverage: xdebug2
 
       - name: Cache composer cache directory
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: composer-cache-dir-${{ matrix.php }}
         with:
@@ -49,7 +49,7 @@ jobs:
         run: composer install
 
       - name: Cache vendor directory of phpcq tool runner
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: vendor-${{ matrix.php }}
         with:
@@ -68,7 +68,7 @@ jobs:
         run: $GITHUB_WORKSPACE/vendor/bin/phpcq run -o github-action -o default ${{ matrix.phpcq_flags }} -v
 
       - name: Upload build directory to artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ success() }} || ${{ failure() }}
         with:
           name: phpcq-builds-php-${{ matrix.php }}