There is an updated pull request by leahneukirchen against master on the void-packages repository

https://github.com/leahneukirchen/void-packages racket87
https://github.com/void-linux/void-packages/pull/40542

racket: update to 8.7.
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A patch file from https://github.com/void-linux/void-packages/pull/40542.patch is attached