REF/FIX: Fix Python 3.11 support and test suite-focused cleanup #129

Job	Run time
standard / Documentation / Python 3.9: documentation building	1m 43s
standard / pre-commit checks / pre-commit	30s
standard / Conda (3.11, true) / Python 3.11: conda	10m 8s
standard / Conda (3.9, true) / Python 3.9: conda	14m 41s
standard / Conda (3.10) / Python 3.10: conda	16m 29s
standard / Pip (3.10) / Python 3.10: pip	8m 50s
standard / Pip (3.11, true) / Python 3.11: pip	4m 50s
standard / Pip (3.9, true) / Python 3.9: pip	7m 57s
standard / Documentation / Documentation deployment	0s
	1h 5m 8s

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