Bump cssnano from 7.0.4 to 7.0.5 in /src/sphinx_antsibull_ext/css #1198

# to view logs

Job	Run time
Build devel docsite	5m 50s
Build stable docsite	5m 34s
Build simple docsite (extra options: --use-current --sphinx-theme sphinx_rtd_theme)	4m 9s
Build simple docsite (extra options: --use-current --sphinx-theme sphinx_rtd_theme)	4m 27s
Build simple docsite (extra options: --no-indexes --squash-hierarchy --intersphinx ansible7:https://docs.ansible.com/ansible/6/ community.crypto --collection-version 2.0.0)	1m 17s
Build simple docsite (extra options: --no-indexes --squash-hierarchy --intersphinx ansible7:https://docs.ansible.com/ansible/6/ community.crypto --collection-version 2.0.0)	1m 16s
Build simple docsite (extra options: --use-current --use-html-blobs --no-breadcrumbs community.crypto community.docker --extra-conf antsibull_ext_color_scheme=none)	1m 42s
Build simple docsite (extra options: --use-current --output-format simplified-rst community.crypto community.docker)	2m 10s
	26m 25s

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