ci: bump actions/checkout from 4 to 6 in the prod-actions group

Bumps the prod-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/bandit.yml

@@ -33,7 +33,7 @@ jobs:
 
     runs-on: ubuntu-slim
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Bandit Scan
         uses: shundor/python-bandit-scan@ab1d87dfccc5a0ffab88be3aaac6ffe35c10d6cd
         with: # optional arguments