fix: overly thin font rendering on mojave

[miniak]

Description of Change

Backport https://github.com/electron/electron/pull/15007 and https://github.com/electron/electron/pull/17737

Checklist

• [x] PR description included and stakeholders cc'd
• [x] Patch information is added to appropriate .patches.yaml
• [x] script/update runs without error
• [x] PR title follows semantic commit guidelines

/cc @codebytere, @deepak1556

[miniak]

@nornagon, @MarshallOfSound can you please review?

[nornagon]

Needs review from @electron/wg-releases

[dalDevelo]

😱 it's finally happening! 👍🏼