Update box-shadow for menus in dark mode #109

Job	Run time
test-postgres-elasticsearch6 (3.7, Django>=3.2,<3.3)	7m 40s
test-postgres-elasticsearch7 (3.8, Django>=4.1,<4.2, false)	8m 2s
test-postgres (3.7, Django>=3.2,<3.3, false)	19m 1s
test-postgres (3.11, Django>=4.2,<4.3, postgres:12, notz, false)	17m 25s
test-postgres (3.10, Django>=4.1,<4.2, false, emailuser)	20m 37s
test-postgres (3.10, git+https://github.com/django/django.git@stable/4.2.x#egg=Django, true, post...	21m 21s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:12,...	17m 8s
test-mysql (3.8, Django>=3.2,<3.3, false)	22m 47s
test-mysql (3.10, Django>=4.2,<4.3, false)	38m 5s
test-sqlite (3.9, Django>=4.1,<4.2)	13m 58s
test-sqlite-elasticsearch5 (3.7, Django>=3.2,<3.3)	7m 32s
test-sqlite-elasticsearch7 (3.9, Django>=4.2,<4.3, emailuser)	10m 4s
coverage	39s
	3h 24m 19s

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