Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -53,10 +53,10 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Checkout build-cs"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: "phpstan/build-cs"
           path: "build-cs"
@@ -104,7 +104,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -143,7 +143,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -180,10 +180,10 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Checkout build-infection"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: "phpstan/build-infection"
           path: "build-infection"

.github/workflows/create-tag.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Generate changelog
         id: changelog