There is a new pull request by daerich against master on the void-packages repository

https://github.com/daerich/void-packages picom9
https://github.com/void-linux/void-packages/pull/35429

picom: update to v9 (9.0)
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/35429.patch is attached