chore(deps): update rust crate swc to v21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
swc	dependencies	major	20.0.0 -> 21.0.0

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codspeed-hq]

CodSpeed Performance Report

Merging #165 will improve performances by 1.86%

_{Comparing renovate/major-swc (9b59eaf) with main (d6724e4)}

Summary

⚡ 12 improvements

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	oxc[no-drop]	84.4 ms	80.1 ms	+5.37%
⚡	oxc[parallel]	170.7 ms	164.3 ms	+3.9%
⚡	oxc[single-thread]	84.4 ms	80 ms	+5.5%
⚡	swc[no-drop]	234.2 ms	220.7 ms	+6.13%
⚡	swc[parallel]	493.3 ms	461.5 ms	+6.9%
⚡	swc[single-thread]	239.3 ms	219.5 ms	+9.02%
⚡	oxc[no-drop]	591.8 ms	568.7 ms	+4.05%
⚡	oxc[parallel]	1.2 s	1.1 s	+4.25%
⚡	oxc[single-thread]	592 ms	568.7 ms	+4.09%
⚡	swc[no-drop]	2.7 s	2.6 s	+1.86%
⚡	swc[parallel]	5.4 s	5.3 s	+1.96%
⚡	swc[single-thread]	2.7 s	2.6 s	+1.92%