ci: bump actions/checkout from 5 to 6 (#66)

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

Author: dependabot[bot]

.github/workflows/reports.yaml

@@ -22,15 +22,15 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           path: gh-pages
           ref: gh-pages
           fetch-depth: 0
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           repository: ${{ env.NEOVIM_REPO }}
           path: 'neovim'