Explicit set minor and patch version on used actions

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/workflows/phpstan.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3.0.0
     - name: Change PHP version
       run: |
         sudo update-alternatives --set php /usr/bin/php8.0
@@ -21,7 +21,7 @@ jobs:
       run: composer validate
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@v3
+      uses: actions/cache@v3.0.0
       with:
         path: vendor
         key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}