Manually add our own theme dependency to fix the docs build

oprypin · oprypin · commit 48c13ba98246 · 2026-03-16T00:46:10.000+01:00
diff --git a/requirements/requirements-docs.txt b/requirements/requirements-docs.txt
@@ -109,6 +109,7 @@ platformdirs==4.0.0
     #   properdocs
     #   mkdocs-get-deps
     #   mkdocstrings
+properdocs-theme-mkdocs
 pymdown-extensions==10.4
     # via
     #   hatch.envs.docs
