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/deploy.yml

@@ -57,7 +57,7 @@ jobs:
         uses: leafo/gh-actions-lua@v11
 
       - name: Install LuaRocks
-        uses: leafo/gh-actions-luarocks@v5
+        uses: leafo/gh-actions-luarocks@v6
 
       - name: Install lunajson
         run: luarocks install lunajson