Deps: Bump actions/checkout from 5 to 6 in the github-actions group #490

Job	Run time
Build the documentation	54s
Check type hints (3.13)	30s
Check type hints (3.10)	29s
Check type hints (3.11)	27s
Check type hints (3.9)	33s
Check type hints (3.12)	26s
Check versioning / Check versioning for consistency	17s
Linting (3.9) / Linting	31s
Run tests (3.13) / Run all tests	32s
Run tests (3.9) / Run all tests	33s
Run tests (3.11) / Run all tests	33s
Run tests (3.12) / Run all tests	33s
Run tests (3.10) / Run all tests	38s
Linting (3.12) / Linting	28s
Linting (3.13) / Linting	30s
Linting (3.10) / Linting	33s
Linting (3.11) / Linting	29s
Upload coverage to codecov.io	39s
	9m 35s

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