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

Update python3-mpv & fix tests
https://github.com/void-linux/void-packages/pull/38364

Description:
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#### Testing the changes
- I tested the changes in this PR: **YES**

python3-xvfbwrapper doesn't cross because [common/environment/build-style/python3-module.sh](https://github.com/void-linux/void-packages/blob/master/common/environment/build-style/python3-module.sh#L2) installs python3 as a makedepend instead of a hostmakedepend and I'm not sure if I should patch the build-style or add python3 to hostmakedepends and ignore that it's also in makedepends
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