ci: automate PR to update LuaRocks version on gh-actions-luarocks (#1808)

On every tagged release of LuaRocks, there is the need to update LuaRocks version at [https://github.com/luarocks/gh-actions-luarocks/blob/22fa5618dc4ddff1fb251b3b38a0766a8c9ae47f/action.yml#L13](https://github.com/luarocks/gh-actions-luarocks/blob/22fa5618dc4ddff1fb251b3b38a0766a8c9ae47f/action.yml#L13) in the repository [https://github.com/luarocks/gh-actions-luarocks](https://github.com/luarocks/gh-actions-luarocks). Often forgotten, the default LuaRocks version on `gh-actions-luarocks` may lag behind the latest LuaRocks release.

Motivated by this comment [https://github.com/luarocks/gh-actions-luarocks/pull/7#issuecomment-2997223378](https://github.com/luarocks/gh-actions-luarocks/pull/7#issuecomment-2997223378), to address this problem, incorporating the changes on this pull request, a new workflow was created to proceed in the following manner:

1. Once a tag is pushed (in the usual format `vX.Y.Z`) on [https://github.com/luarocks/luarocks](https://github.com/luarocks/luarocks), or in a manual workflow triggered by the tag ref, a sanitization step is performed to extract `X.Y.Z` from the `vX.Y.Z` in the job `SanitizeVersion`;
2. In a subsequent job (`CreatePullRequest`), a PR is created at [https://github.com/luarocks/gh-actions-luarocks](https://github.com/luarocks/gh-actions-luarocks) replacing the outdated version by the value `X.Y.Z` extracted earlier. 

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