Upgrade `ruff` and replace `black` with `ruff format` #43

Job	Run time
test-mysql (3.9, Django>=3.2,<3.3, false)	35s
test-mysql (3.11, Django>=4.2,<4.3, false, --parallel, mysql:8.1)	30s
test-sqlite (3.10, Django>=4.1,<4.2)	14m 52s
test-sqlite-elasticsearch8 (3.10, Django>=4.2,<4.3, emailuser)	1m 23s
test-postgres (3.8, Django>=3.2,<3.3, false, --parallel)	33s
test-postgres (3.11, Django>=4.1,<4.2, false, emailuser, --parallel)	32s
test-sqlite-opensearch2 (3.9, Django>=4.1,<4.2, false)	4m 41s
test-postgres (3.12, Django>=4.2,<4.3, postgres:15, notz, false, --parallel)	30s
test-postgres-elasticsearch7 (3.8, Django>=3.2,<3.3, false)	22s
test-postgres (3.10, git+https://github.com/django/django.git@stable/5.0.x#egg=Django, true)	33s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:lat...	34s
coverage	1s
	25m 6s

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