build: upgrade pnpm to 12 for 4x faster installs (#22738)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
f4a3843a1cTheo Browne committed on 10/21/2026, 8:07:46 AM· committed by GitHubparent618761a
3 files changedLine totals unavailable