Revert "Bump stylelint from 14.3.0 to 15.10.1" #87

Job	Run time
test-postgres-elasticsearch7 (3.8, Django>=4.1,<4.2, false)	7m 59s
test-mysql (3.8, Django>=3.2,<3.3, false)	30m 39s
test-mysql (3.10, Django>=4.2,<4.3, false)	30m 43s
test-postgres-elasticsearch6 (3.7, Django>=3.2,<3.3)	7m 31s
test-postgres (3.7, Django>=3.2,<3.3, false)	27m 43s
test-postgres (3.11, Django>=4.2,<4.3, postgres:12, notz, false)	22m 24s
test-postgres (3.10, Django>=4.1,<4.2, false, emailuser)	16m 7s
test-postgres (3.10, git+https://github.com/django/django.git@stable/4.2.x#egg=Django, true, post...	16m 25s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:12,...	16m 51s
test-sqlite (3.9, Django>=4.1,<4.2)	10m 59s
test-sqlite-elasticsearch5 (3.7, Django>=3.2,<3.3)	10m 14s
test-sqlite-elasticsearch7 (3.9, Django>=4.2,<4.3, emailuser)	6m 33s
coverage	33s
	3h 24m 41s

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