There is a new pull request by oreo639 against master on the void-packages repository

https://github.com/oreo639/void-packages gtksourceview5
https://github.com/void-linux/void-packages/pull/42926

gtksourceview5: update to 5.8.0.
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#### Testing the changes
- I tested the changes in this PR: **briefly**

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A patch file from https://github.com/void-linux/void-packages/pull/42926.patch is attached