build(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/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](https://github.com/actions/checkout/compare/v4...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/community.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.ref == 'refs/heads/main' && github.repository_owner == 'folke' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: folke/github/neovim@main
       - name: Rockspec Build
         id: rockspec-build

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
     env:
       GH_TOKEN: ${{ github.token }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: docs
       - name: Generate Docs