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/general.yml

@@ -10,7 +10,7 @@ jobs:
     name: "REUSE Lint"
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: REUSE lint
         uses: fsfe/reuse-action@v1

.github/workflows/integration-tests.yml

@@ -18,7 +18,7 @@ jobs:
             experimental: true
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -59,7 +59,7 @@ jobs:
                     experimental: true
       steps:
           - name: Checkout
-            uses: actions/checkout@v3
+            uses: actions/checkout@v4
 
           - name: Setup PHP
             uses: shivammathur/setup-php@v2

.github/workflows/php-tests.yml

@@ -28,7 +28,7 @@ jobs:
             experimental: true
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -62,7 +62,7 @@ jobs:
     name: "PHPCS"
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHPCS
         uses: shivammathur/setup-php@v2
@@ -80,7 +80,7 @@ jobs:
     name: "PHPStan"
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHPStan
         uses: shivammathur/setup-php@v2