Update box-shadow for menus in dark mode #114

Job	Run time
test-sqlite (3.9, Django>=4.1,<4.2)	10m 43s
test-mysql (3.8, Django>=3.2,<3.3, false)	21m 29s
test-mysql (3.10, Django>=4.2,<4.3, false)	47m 46s
test-postgres (3.7, Django>=3.2,<3.3, false)	24m 12s
test-postgres (3.11, Django>=4.2,<4.3, postgres:12, notz, false)	16m 5s
test-postgres (3.10, Django>=4.1,<4.2, false, emailuser)	15m 9s
test-postgres (3.10, git+https://github.com/django/django.git@stable/4.2.x#egg=Django, true, post...	16m 48s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:12,...	16m 22s
test-postgres-elasticsearch6 (3.7, Django>=3.2,<3.3)	10m 42s
test-postgres-elasticsearch7 (3.8, Django>=4.1,<4.2, false)	9m 4s
test-sqlite-elasticsearch5 (3.7, Django>=3.2,<3.3)	7m 41s
test-sqlite-elasticsearch7 (3.9, Django>=4.2,<4.3, emailuser)	7m 15s
coverage	31s
	3h 23m 47s

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