Add support for Python 3.11 & 3.12 #310

Job	Run time
Tests (ubuntu-20.04, 3.8, quality)	50s
Tests (ubuntu-20.04, 3.8, quality)	50s
Tests (ubuntu-20.04, 3.8, django42-drf314)	47s
Tests (ubuntu-20.04, 3.8, django42-drf314)	47s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	48s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	1m 21s
Tests (ubuntu-20.04, 3.11, quality)	50s
Tests (ubuntu-20.04, 3.11, quality)	50s
Tests (ubuntu-20.04, 3.11, django42-drf314)	49s
Tests (ubuntu-20.04, 3.11, django42-drf314)	49s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	46s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	46s
Tests (ubuntu-20.04, 3.12, quality)	1m 4s
Tests (ubuntu-20.04, 3.12, quality)	1m 4s
Tests (ubuntu-20.04, 3.12, django42-drf314)	1m 5s
Tests (ubuntu-20.04, 3.12, django42-drf314)	1m 5s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	1m 4s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	1m 4s
	16m 39s

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