v15.4.0-canary.53

Core Changes

• [ppr] Narrow condition for fallback shell generation at runtime: #79565

Misc Changes

• Turbopack: use unsigned values for follower and upper edges: #79489
• [release] fix: correctly set tag during publish: #79548
• [release] use backport NPM dist tag for backports: #79538
• [release-new] fix: release pr commit contains (#number) at last: #79611
• Unflake Undefined default export test: #79632
• [release-new] move "add label to pr" workflow from publish to trigger: #79619

Credits

Huge thanks to @sokra, @devjiwonchoi, @wyattjoh, and @unstubbable for helping!