chore: Upgrade Python requirements + Drop support for Python 3.8 #340

Job	Run time
Tests (ubuntu-20.04, 3.8, quality)	45s
Tests (ubuntu-20.04, 3.8, docs)	31s
Tests (ubuntu-20.04, 3.8, django42-drf315)	38s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	41s
Tests (ubuntu-20.04, 3.11, quality)	43s
Tests (ubuntu-20.04, 3.11, docs)	27s
Tests (ubuntu-20.04, 3.11, django42-drf315)	37s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	35s
Tests (ubuntu-20.04, 3.12, quality)	46s
Tests (ubuntu-20.04, 3.12, docs)	41s
Tests (ubuntu-20.04, 3.12, django42-drf315)	50s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	52s
Tests (ubuntu-latest, 3.8, quality)	42s
Tests (ubuntu-latest, 3.8, docs)	30s
Tests (ubuntu-latest, 3.8, django42-drf315)	41s
Tests (ubuntu-latest, 3.8, django42-drflatest)	41s
Tests (ubuntu-latest, 3.11, quality)	42s
Tests (ubuntu-latest, 3.11, docs)	36s
Tests (ubuntu-latest, 3.11, django42-drf315)	36s
Tests (ubuntu-latest, 3.11, django42-drflatest)	40s
Tests (ubuntu-latest, 3.12, quality)	48s
Tests (ubuntu-latest, 3.12, docs)	38s
Tests (ubuntu-latest, 3.12, django42-drf315)	48s
Tests (ubuntu-latest, 3.12, django42-drflatest)	46s
	16m 14s

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