Merge pull request #2924 from freifunk-gluon/dependabot/pip/docs/sphinx-rtd-theme-1.2.2

build(deps): bump sphinx-rtd-theme from 1.2.0 to 1.2.2 in /docs

docs/requirements.txt

-sphinx-rtd-theme==1.2.0
+sphinx-rtd-theme==1.2.2