Remove CST-based fixers for C405 and C409

[charliermarsh]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #9821 will improve performances by 8.42%

_{Comparing charlie/lcst2 (cb00129) with main (c5fa0cc)}

Summary

⚡ 2 improvements
✅ 28 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	charlie/lcst2	Change
⚡	linter/all-rules[unicode/pypinyin.py]	11.6 ms	10.7 ms	+8.42%
⚡	linter/all-with-preview-rules[unicode/pypinyin.py]	12.6 ms	11.6 ms	+8.38%

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 1 project error)

sphinx-doc/sphinx (error)

ruff failed
  Cause: Selection of unstable rules without the `--preview` flag is not allowed. Enable preview or remove selection of:
	- FURB113
	- FURB131
	- FURB132

Linter (preview)

✅ ecosystem check detected no linter changes.