There's a merged pull request on the void-packages repository

OpenLP: update to 2.9.4.
https://github.com/void-linux/void-packages/pull/36014

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Current version in repo is broken due to what I'm suspecting are just deprecation errors, and is also very old (March 31, 2017). This version is [technically an RC for 3.0](https://openlp.org/blog/2022/01/18/new-release-openlp-30-rc1-294-mighty-malachi) but since it works and the current version in repo doesn't, I figured I would open a PR.