Bump actions/checkout from 2 to 4 (#203)

Author: dependabot[bot]

.github/workflows/php-linter.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event.pull_request.draft == false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
           ref: ${{ github.event.client_payload.pull_request.head.ref }}

.github/workflows/phpstan.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Setup PHP
         id: setup-php

.github/workflows/publish-to-redaxo-org.yml

@@ -10,7 +10,7 @@ jobs:
   redaxo_publish:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: FriendsOfREDAXO/installer-action@v1
       with:
         myredaxo-username: ${{ secrets.MYREDAXO_USERNAME }}