v4: Fix main actor references in iOS 11-12#4683

Draft

aboedo wants to merge 4 commits intorelease/4.43.3from andy/fix-main-actor-references-iOS-11

+54-33

Commits on Jan 15, 2025

added a to-do in all references to main actor that don't have OS version checks
aboedo
committed

Commits on Jan 17, 2025