chore: release 1.2.4

[JSerFeng]

Summary

Release version routine

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	7b7e903
🔍 Latest deploy log	https://app.netlify.com/sites/rspack/deploys/67b48a9ddddf860008934860

[codspeed-hq]

CodSpeed Performance Report

Merging #9356 will not alter performance

_{Comparing chore/release-rspack (7b7e903) with main (fee8ae9)}

🎉 Hooray! codspeed-node just leveled up to 4.0.0!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 7 untouched benchmarks

[github-actions]

📝 Ecosystem CI detail: Open

suite	result
modernjs	✅ success
rspress	✅ success
rslib	❌ failure
rsbuild	❌ failure
rsdoctor	❌ failure
examples	❌ failure
devserver	✅ success
nuxt	✅ success