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

[WIP] ibus: update to 1.5.24
https://github.com/void-linux/void-packages/pull/29025

Description:
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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

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- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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`ibus` doesn't work on `sway`, so I can't test it. But it did build.
Changes I made: disable python2, enable gtk4. Seems reasonable.
Feel free to take over this.