Bump actions/checkout from 4 to 6 #5

Job	Run time
Validate coverage	39s
Build the documentation	26s
Lint the package	19s
Python: 3.8-x64 on macos-13	56s
Python: 3.8-x86 on windows-latest	2m 4s
Python: 3.9-x64 on windows-latest	1m 6s
Python: 3.9-arm64 on macos-14	6h 0m 17s
Python: 3.8-x64 on windows-latest	1m 51s
Python: 3.9-x64 on ubuntu-22.04	39s
Python: 3.8-x64 on ubuntu-22.04	6h 0m 16s
Python: 3.10-x64 on ubuntu-22.04	32s
Python: 3.9-x86 on windows-latest	2m 8s
Python: 3.10-x64 on windows-latest	1m 12s
Python: 3.10-x64 on macos-13	47s
Python: 3.10-arm64 on macos-14	43s
Python: 3.11-x86 on windows-latest	2m 6s
Python: 3.11-x64 on ubuntu-22.04	36s
Python: 3.10-x86 on windows-latest	1m 59s
Python: 3.11-x64 on windows-latest	1m 43s
Python: 3.11-x64 on macos-13	48s
Python: 3.12-x64 on ubuntu-22.04	34s
Python: 3.11-arm64 on macos-14	6h 0m 17s
Python: 3.9-x64 on macos-13	6h 0m 17s
Python: 3.12-x64 on windows-latest	1m 8s
Python: 3.12-arm64 on macos-14	31s
Python: 3.12-x86 on windows-latest	2m 13s
Python: pypy-3.10-x64 on ubuntu-22.04	42s
Python: pypy-3.10-x64 on windows-latest	1m 56s
Python: pypy-3.10-arm64 on macos-14	42s
Python: 3.12-x64 on macos-13	6h 0m 15s
Python: pypy-3.10-x64 on macos-13	1m 0s
Python: pypy-3.10-x86 on windows-latest	1m 46s
Python: pypy-3.9-x64 on ubuntu-22.04	48s
Python: pypy-3.8-x64 on ubuntu-22.04	50s
	1d 6h 34m 6s

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