chore(deps): update actions/checkout action to v7 #767

Job	Run time
PR title check	4s
Checks / Spell check	7s
Checks / Integration tests (3.14, ubuntu-latest)	2m 31s
Checks / Integration tests (3.11, ubuntu-latest)	2m 28s
Checks / Package check	15s
Checks / Actions lint check	32s
Checks / Docstrings check	11s
Checks / Lint check / Lint check (3.13)	18s
Checks / Doc check / Docs check	1m 13s
Checks / Lint check / Lint check (3.14)	11s
Checks / Lint check / Lint check (3.11)	13s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	40s
Checks / Type check / Type check (3.11)	9s
Checks / Type check / Type check (3.12)	9s
Checks / Lint check / Lint check (3.12)	12s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 3s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	40s
Checks / Type check / Type check (3.13)	13s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 5s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	46s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	50s
Checks / Type check / Type check (3.14)	12s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 2s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 9s
	16m 13s

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