chore(deps): update actions/checkout action to v6 #464

Job	Run time
Docs check / Docs check	58s
Type check / Type check (3.11)	16s
Type check / Type check (3.10)	15s
Type check / Type check (3.12)	13s
Type check / Type check (3.13)	12s
Type check / Type check (3.14)	14s
Lint check / Lint check (3.12)	12s
Lint check / Lint check (3.10)	12s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Lint check / Lint check (3.14)	11s
Lint check / Lint check (3.11)	9s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Async dostrings check / Async docstrings check	19s
Lint check / Lint check (3.13)	13s
Unit tests / Unit tests (ubuntu-latest, 3.12)	23s
Unit tests / Unit tests (windows-latest, 3.10)	38s
Unit tests / Unit tests (windows-latest, 3.11)	42s
Unit tests / Unit tests (ubuntu-latest, 3.13)	30s
Unit tests / Unit tests (ubuntu-latest, 3.14)	24s
Unit tests / Unit tests (windows-latest, 3.14)	51s
Unit tests / Unit tests (windows-latest, 3.13)	40s
Unit tests / Unit tests (windows-latest, 3.12)	44s
Integration tests / Integration tests (3.11)	39s
Integration tests / Integration tests (3.13)	39s
Integration tests / Integration tests (3.10)	37s
Integration tests / Integration tests (3.14)	39s
Integration tests / Integration tests (3.12)	39s
	12m 21s

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