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

devhelp: gedit plugin depends on python3.
https://github.com/void-linux/void-packages/pull/28907

Description:
As seen in [1], the loader for this plugin is python3.

[1]
https://gitlab.gnome.org/GNOME/devhelp/-/blob/18f3d0d671540f3d2d6a5e1d5704681519420441/plugins/gedit-plugin/devhelp.plugin.desktop.in

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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)

#### Have the results of the proposed changes been tested?
- [ ] 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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