chore(deps): bump leafo/gh-actions-luarocks from 5 to 6

Bumps [leafo/gh-actions-luarocks](https://github.com/leafo/gh-actions-luarocks) from 5 to 6.
- [Release notes](https://github.com/leafo/gh-actions-luarocks/releases)
- [Commits](leafo/gh-actions-luarocks@v5...v6)

---
updated-dependencies:
- dependency-name: leafo/gh-actions-luarocks
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -38,6 +38,6 @@ jobs:
       - uses: leafo/gh-actions-lua@v11
         with:
           luaVersion: "5.1.5"
-      - uses: leafo/gh-actions-luarocks@v5
+      - uses: leafo/gh-actions-luarocks@v6
       - name: Run nvim-test tests
         run: nix shell nixpkgs#bash nixpkgs#just -c just test ${{ matrix.nvim-version }}