Deps: Bump actions/checkout from 6.0.3 to 7.0.0 #687

Job	Run time
Check versioning for consistency	10s
Build the documentation	32s
Run tests (3.12)	17s
Check type hints (3.11)	12s
Run tests (3.10)	20s
Run tests (3.13)	18s
Run tests (3.14)	18s
Run tests (3.11)	19s
Linting (3.11)	8s
Linting (3.10)	9s
Linting (3.13)	9s
Linting (3.14)	9s
Linting (3.12)	10s
Check type hints (3.12)	16s
Check type hints (3.13)	12s
Check type hints (3.10)	16s
Check type hints (3.14)	12s
Upload coverage to codecov.io	24s
	4m 31s

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