chore: Upgrade Python requirements + Drop support for Python 3.8 #333

Job	Run time
Tests (ubuntu-20.04, 3.8, quality)	40s
Tests (ubuntu-20.04, 3.8, docs)	32s
Tests (ubuntu-20.04, 3.8, django42-drf315)	43s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	37s
Tests (ubuntu-20.04, 3.11, quality)	39s
Tests (ubuntu-20.04, 3.11, docs)	30s
Tests (ubuntu-20.04, 3.11, django42-drf315)	40s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	36s
Tests (ubuntu-20.04, 3.12, quality)	47s
Tests (ubuntu-20.04, 3.12, docs)	41s
Tests (ubuntu-20.04, 3.12, django42-drf315)	58s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	50s
Tests (ubuntu-latest, 3.8, quality)	47s
Tests (ubuntu-latest, 3.8, docs)	32s
Tests (ubuntu-latest, 3.8, django42-drf315)	39s
Tests (ubuntu-latest, 3.8, django42-drflatest)	42s
Tests (ubuntu-latest, 3.11, quality)	38s
Tests (ubuntu-latest, 3.11, docs)	29s
Tests (ubuntu-latest, 3.11, django42-drf315)	39s
Tests (ubuntu-latest, 3.11, django42-drflatest)	37s
Tests (ubuntu-latest, 3.12, quality)	46s
Tests (ubuntu-latest, 3.12, docs)	37s
Tests (ubuntu-latest, 3.12, django42-drf315)	50s
Tests (ubuntu-latest, 3.12, django42-drflatest)	45s
	16m 14s

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