build(deps): bump actions/checkout from 2 to 4 #338

Job	Run time
Tests (ubuntu-20.04, 3.8, quality)	42s
Tests (ubuntu-20.04, 3.8, docs)	27s
Tests (ubuntu-20.04, 3.8, django42-drf315)	39s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	38s
Tests (ubuntu-20.04, 3.11, quality)	46s
Tests (ubuntu-20.04, 3.11, docs)	35s
Tests (ubuntu-20.04, 3.11, django42-drf315)	43s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	43s
Tests (ubuntu-20.04, 3.12, quality)	50s
Tests (ubuntu-20.04, 3.12, docs)	40s
Tests (ubuntu-20.04, 3.12, django42-drf315)	53s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	56s
Tests (ubuntu-latest, 3.8, quality)	40s
Tests (ubuntu-latest, 3.8, docs)	32s
Tests (ubuntu-latest, 3.8, django42-drf315)	42s
Tests (ubuntu-latest, 3.8, django42-drflatest)	38s
Tests (ubuntu-latest, 3.11, quality)	40s
Tests (ubuntu-latest, 3.11, docs)	30s
Tests (ubuntu-latest, 3.11, django42-drf315)	41s
Tests (ubuntu-latest, 3.11, django42-drflatest)	39s
Tests (ubuntu-latest, 3.12, quality)	50s
Tests (ubuntu-latest, 3.12, docs)	40s
Tests (ubuntu-latest, 3.12, django42-drf315)	52s
Tests (ubuntu-latest, 3.12, django42-drflatest)	52s
	16m 48s

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