build(deps): bump actions/checkout from 2 to 4 #332

Job	Run time
Tests (ubuntu-20.04, 3.8, quality)	43s
Tests (ubuntu-20.04, 3.8, docs)	31s
Tests (ubuntu-20.04, 3.8, django42-drf315)	42s
Tests (ubuntu-20.04, 3.8, django42-drflatest)	36s
Tests (ubuntu-20.04, 3.11, quality)	39s
Tests (ubuntu-20.04, 3.11, docs)	30s
Tests (ubuntu-20.04, 3.11, django42-drf315)	43s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	41s
Tests (ubuntu-20.04, 3.12, quality)	51s
Tests (ubuntu-20.04, 3.12, docs)	45s
Tests (ubuntu-20.04, 3.12, django42-drf315)	55s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	57s
Tests (ubuntu-latest, 3.8, quality)	42s
Tests (ubuntu-latest, 3.8, docs)	29s
Tests (ubuntu-latest, 3.8, django42-drf315)	40s
Tests (ubuntu-latest, 3.8, django42-drflatest)	43s
Tests (ubuntu-latest, 3.11, quality)	40s
Tests (ubuntu-latest, 3.11, docs)	32s
Tests (ubuntu-latest, 3.11, django42-drf315)	47s
Tests (ubuntu-latest, 3.11, django42-drflatest)	43s
Tests (ubuntu-latest, 3.12, quality)	57s
Tests (ubuntu-latest, 3.12, docs)	48s
Tests (ubuntu-latest, 3.12, django42-drf315)	51s
Tests (ubuntu-latest, 3.12, django42-drflatest)	52s
	17m 17s

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