Bump sass from 1.80.6 to 1.81.0 in /src/sphinx_antsibull_ext/css #1388

Job	Run time
Build simple docsite (extra options: --use-current --sphinx-theme sphinx_rtd_theme)	4m 3s
Build simple docsite (extra options: --use-current --sphinx-theme sphinx_rtd_theme)	4m 23s
Build simple docsite (extra options: --no-indexes --squash-hierarchy --intersphinx ansible7:https://docs.ansible.com/ansible/6/ community.crypto --collection-version 2.0.0)	2m 11s
Build simple docsite (extra options: --no-indexes --squash-hierarchy --intersphinx ansible7:https://docs.ansible.com/ansible/6/ community.crypto --collection-version 2.0.0)	2m 6s
Build stable docsite	5m 59s
Build simple docsite (extra options: --use-current --use-html-blobs --no-breadcrumbs community.crypto community.docker --extra-conf antsibull_ext_color_scheme=none)	2m 24s
Build devel docsite	6m 36s
Build simple docsite (extra options: --use-current --output-format simplified-rst community.crypto community.docker)	2m 27s
	30m 9s

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