There's a new version of alabaster available.
You are currently using 0.7.8. I have updated it to 0.7.10

These links might come in handy: PyPI | Changelog | Docs

Changelog

0.7.9

• :feature:6 (and :issue:70, both via :issue:84) Make all remaining
  hardcoded style colors configurable, plus related cleanup (such as improving
  differentiation of some admonition blocks such as warn and note,
  ensuring generic admonitions are left untouched, etc). Credit:
  ShadowKyogre.
• :feature:83 Expose Sphinx's toctree collapse option as the new
  sidebar_collapse config option. Credit: Eric Holscher.
• :feature:80 Add support for <link rel="canonical"> (i.e. canonical
  URLs). Thanks to Ben Gamari for the patch.
• :support:7 Generate real documentation site, both because the README is
  just too big now, and so we can eat our own dog food <https://en.wikipedia.org/wiki/Eating_your_own_dog_food>_.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖