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/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: |
@@ -34,7 +34,7 @@ jobs:
             php-version: "8.3"
 
       -   name: "Checkout code"
-          uses: "actions/checkout@v3"
+          uses: "actions/checkout@v4"
 
       -   name: "Install dependencies"
           uses: "ramsey/composer-install@v2"
@@ -70,7 +70,7 @@ jobs:
             coverage: "xdebug"
 
       -   name: "Checkout code"
-          uses: "actions/checkout@v3"
+          uses: "actions/checkout@v4"
 
       -   name: "Install dependencies"
           uses: "ramsey/composer-install@v2"
@@ -103,7 +103,7 @@ jobs:
             extensions: "json, mbstring, openssl, sqlite3, curl, uuid"
 
       -   name: "Checkout code"
-          uses: "actions/checkout@v3"
+          uses: "actions/checkout@v4"
 
       -   name: "Validate Composer configuration"
           run: "composer validate --strict"
@@ -131,7 +131,7 @@ jobs:
             extensions: "json, mbstring, openssl, sqlite3, curl, uuid"
 
       -   name: "Checkout code"
-          uses: "actions/checkout@v3"
+          uses: "actions/checkout@v4"
 
       -   name: "Check adherence to EditorConfig"
           uses: "greut/eclint-action@v0"
@@ -159,7 +159,7 @@ jobs:
             extensions: "json, mbstring, openssl, sqlite3, curl, uuid"
 
       -   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}"
@@ -188,7 +188,7 @@ 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}"
@@ -210,7 +210,7 @@ jobs:
     runs-on: "ubuntu-20.04"
     steps:
       -   name: "Checkout code"
-          uses: "actions/checkout@v3"
+          uses: "actions/checkout@v4"
 
       -   name: "Check exported files"
           run: |