Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/apiref.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"

.github/workflows/backward-compatibility.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -53,10 +53,10 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Checkout build-cs"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: "phpstan/build-cs"
           path: "build-cs"
@@ -104,7 +104,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -144,7 +144,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"

.github/workflows/create-tag.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}

.github/workflows/merge-maintained-branch.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "Merge branch"
         uses: everlytic/branch-merge@1.1.5
         with:

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Generate changelog
         id: changelog

.github/workflows/send-pr.yml

@@ -18,7 +18,7 @@ jobs:
           php-version: "8.1"
 
       - name: "Checkout phpstan-src"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: phpstan/phpstan-src
           path: phpstan-src

.github/workflows/test-slevomat-coding-standard.yml

@@ -25,10 +25,10 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Checkout Slevomat Coding Standard"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: slevomat/coding-standard
           path: slevomat-cs