Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pre-release-tests.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Grep docker latest rc version of Meilisearch
         id: grep-step
@@ -74,7 +74,7 @@ jobs:
     name: integration-tests-against-rc (PHP ${{ matrix.php-version }}) (Symfony ${{ matrix.sf-version }}.*)
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install PHP
         uses: shivammathur/setup-php@v2

.github/workflows/tests.yml

@@ -77,7 +77,7 @@ jobs:
     name: integration-tests (PHP ${{ matrix.php-version }}) (Symfony ${{ matrix.sf-version }}.*)${{ matrix.dependencies != 'default' && format(' ({0})', matrix.dependencies) || '' }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install PHP
         uses: shivammathur/setup-php@v2
@@ -115,7 +115,7 @@ jobs:
     env:
       PHP_CS_FIXER_IGNORE_ENV: 1
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install PHP
         uses: shivammathur/setup-php@v2
@@ -149,7 +149,7 @@ jobs:
     name: Yaml linting check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Yaml lint check
         uses: ibiqlik/action-yamllint@v3
         with:
@@ -163,7 +163,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2