use v4 checkout action

Author: splitbrain

.github/workflows/autofix.yml

@@ -22,7 +22,7 @@ jobs:
       ( github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository )
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/cs.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/matrix.yml

@@ -26,6 +26,6 @@ jobs:
       minphp: ${{ steps.matrix.outputs.minphp }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - id: matrix
         uses: dokuwiki/github-action/.github/actions/phpmatrix@main

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2