[red-knot] unswap naming of benchmark groups

[carljm]

Unless there's some logic in criterion_group! that I really don't understand, it looks like these benchmark group names were swapped, so the group labeled without_parse was actually the cold benchmark, and vice versa. Not sure this practically matters, since the benchmark function names were correct.

[codspeed-hq]

CodSpeed Performance Report

Merging #12396 will not alter performance

_{Comparing cjm/fix-benchmark-naming (d901769) with cjm/bench-preparse-builtins (93cf6b5)}

Summary

✅ 31 untouched benchmarks

🆕 2 new benchmarks
⁉️ 2 (👁 2) dropped benchmarks

Benchmarks breakdown

	Benchmark	cjm/bench-preparse-builtins	cjm/fix-benchmark-naming	Change
🆕	red_knot_check_file[cold]	N/A	346.1 µs	N/A
👁	red_knot_check_file[without_parse]	257 µs	N/A	N/A
👁	red_knot_check_file[cold]	343.9 µs	N/A	N/A
🆕	red_knot_check_file[without_parse]	N/A	258.4 µs	N/A

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.