Bump actions/checkout from 1 to 6 in the github-actions group (#34)

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


Updates `actions/checkout` from 1 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v1...v6)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/PublishDocumentation.yml

@@ -8,7 +8,7 @@ jobs:
   deploy_docs:
     runs-on: macOS-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v6
     - name: Publish Jazzy Docs
       uses: steven0351/publish-jazzy-docs@v1.1.2
       with: