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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-docker-images.yml

@@ -26,7 +26,7 @@ jobs:
       backend: ${{ steps.filter.outputs.backend }}
     steps:
       # For pull requests it's not necessary to checkout the code
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         if: github.event_name != 'pull_request'
       - uses: dorny/paths-filter@v3
         id: filter
@@ -53,7 +53,7 @@ jobs:
       run:
         working-directory: ./backend/api
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -121,7 +121,7 @@ jobs:
       run:
         working-directory: ./backend/archiver
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -188,7 +188,7 @@ jobs:
     if: ${{ needs.detect_changes.outputs.archiver == 'true' }} || github.event_name != 'pull_request'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Log into registry ${{ env.REGISTRY }}
         # if: github.event_name != 'pull_request'
@@ -231,7 +231,7 @@ jobs:
     if: ${{ needs.detect_changes.outputs.prefect == 'true' }} || github.event_name != 'pull_request'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Log into registry ${{ env.REGISTRY }}
         # if: github.event_name != 'pull_request'
@@ -275,7 +275,7 @@ jobs:
     needs: test_service_api
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Generate API
         uses: addnab/docker-run-action@v3

.github/workflows/deploy-gh-pages.yml

@@ -13,7 +13,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Configure Git Credentials
         run: |
           git config user.name github-actions[bot]