Add Python 3.11 to tests and support Pandas 2 (#20) #45

Job	Run time
pre-commit	14s
Unit tests on ubuntu-latest with Python 3.8	55s
Unit tests on ubuntu-latest with Python 3.9	48s
Unit tests on ubuntu-latest with Python 3.10	51s
Unit tests on ubuntu-latest with Python 3.11	49s
Unit tests on macos-latest with Python 3.8	1m 45s
Unit tests on macos-latest with Python 3.9	1m 16s
Unit tests on macos-latest with Python 3.10	1m 14s
Unit tests on macos-latest with Python 3.11	1m 25s
Unit tests on windows-latest with Python 3.8	1m 48s
Unit tests on windows-latest with Python 3.9	2m 34s
Unit tests on windows-latest with Python 3.10	2m 49s
Unit tests on windows-latest with Python 3.11	2m 36s
	19m 4s

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