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

pnpm: update to 8.6.0
https://github.com/void-linux/void-packages/pull/44165

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

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)

cc @fnogcps

The 7.x branch of pnpm is no longer maintained (according to https://pnpm.io/versions), and I couldn't find any reasons to not switch to the 8.x branch. 
pnpm 8 dropped support for nodejs 14, but since we're already using nodejs 16 that shouldn't be an issue.