Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/infection.yml

@@ -21,7 +21,7 @@ jobs:
           tools: castor
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Fetch Git base reference"
         run: "git fetch --depth=1 origin ${GITHUB_BASE_REF}"

.github/workflows/integrate.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Check file permissions"
         run: |
@@ -35,7 +35,7 @@ jobs:
           coverage: "none"
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Install dependencies"
         uses: "ramsey/composer-install@v3"
@@ -72,7 +72,7 @@ jobs:
           coverage: "xdebug"
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Install dependencies"
         uses: "ramsey/composer-install@v3"
@@ -107,7 +107,7 @@ jobs:
           coverage: "none"
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Validate Composer configuration"
         run: "castor validate"
@@ -137,7 +137,7 @@ jobs:
           coverage: "none"
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Install dependencies"
         uses: "ramsey/composer-install@v3"
@@ -166,7 +166,7 @@ jobs:
           tools: castor
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Install dependencies"
         uses: "ramsey/composer-install@v3"
@@ -193,7 +193,7 @@ jobs:
           coverage: "xdebug"
 
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Fetch Git base reference"
         run: "git fetch --depth=1 origin ${GITHUB_BASE_REF}"
@@ -215,7 +215,7 @@ jobs:
     runs-on: "ubuntu-20.04"
     steps:
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Check exported files"
         run: |