chore: drop support for Python 3.7 / 3.8 #57

Job	Run time
Build the documentation	18s
Lint the package	21s
Validate coverage	18s
Python: 3.9-x64 on ubuntu-latest	13s
Python: 3.9-x64 on windows-latest	1m 5s
Python: 3.9-x86 on windows-latest	57s
Python: 3.9-x64 on macos-12	1s
Python: 3.10-x64 on ubuntu-latest	13s
Python: 3.10-x64 on windows-latest	34s
Python: 3.10-x86 on windows-latest	47s
Python: 3.10-x64 on macos-12	1s
Python: 3.11-x64 on ubuntu-latest	21s
Python: 3.11-x64 on windows-latest	55s
Python: 3.11-x86 on windows-latest	1m 26s
Python: 3.11-x64 on macos-12	1s
Python: 3.12-x64 on ubuntu-latest	15s
Python: 3.12-x64 on windows-latest	56s
Python: 3.12-x86 on windows-latest	40s
Python: 3.12-x64 on macos-12	1s
Python: 3.13-x64 on ubuntu-latest	15s
Python: 3.13-x64 on windows-latest	41s
Python: 3.13-x86 on windows-latest	40s
Python: 3.13-x64 on macos-12	1s
Python: pypy-3.10-x64 on ubuntu-latest	37s
Python: pypy-3.10-x64 on windows-latest	55s
Python: pypy-3.10-x86 on windows-latest	1m 42s
Python: pypy-3.10-x64 on macos-12	1s
	14m 15s

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