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

Signal-Desktop: update to 1.33.3.
https://github.com/void-linux/void-packages/pull/21358

Description:
They switched from spellchecker to typo-js in https://github.com/signalapp/Signal-Desktop/commit/9e9401693c so changes in commit b7e6be3f are no longer required.