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](https://github.com/actions/checkout/compare/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>

.github/workflows/test_and_deploy.yml

@@ -6,7 +6,7 @@ jobs:
     name: Test
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         id: setup-beam
         with:
@@ -95,7 +95,7 @@ jobs:
     if: github.ref == 'refs/heads/main'
     concurrency: deploy-group
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gacts/install-hurl@v1
       - name: 🚀 Deploy to production
         run: hurl --test --report-tap deploy.tap scripts/prod/deploy.hurl