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/continuous_integration.yml

@@ -29,7 +29,7 @@ jobs:
           access_token: ${{ github.token }}
 
       - name: "Checkout"
-        uses: "actions/checkout@v5"
+        uses: "actions/checkout@v6"
 
       - name: "Install PHP with extensions"
         uses: "shivammathur/setup-php@v2"
@@ -100,7 +100,7 @@ jobs:
       fail-fast: false
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v5"
+        uses: "actions/checkout@v6"
       - name: "Install PHP with extensions"
         uses: "shivammathur/setup-php@v2"
         with:

.github/workflows/doc_generation.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
 
       - name: "Checkout"
-        uses: "actions/checkout@v5"
+        uses: "actions/checkout@v6"
 
       - name: "Setup NodeJS"
         uses: actions/setup-node@v5