Bump tomlkit from 0.9.2 to 0.10.0 in /docs (#252)

Bumps [tomlkit](https://github.com/sdispater/tomlkit) from 0.9.2 to 0.10.0.
- [Release notes](https://github.com/sdispater/tomlkit/releases)
- [Changelog](https://github.com/sdispater/tomlkit/blob/master/CHANGELOG.md)
- [Commits](python-poetry/tomlkit@0.9.2...0.10.0)

---
updated-dependencies:
- dependency-name: tomlkit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -4,4 +4,4 @@
 sphinx==4.4.0
 sphinx-readable-theme==1.3.0
 m2r2==0.3.2
-tomlkit==0.9.2
+tomlkit==0.10.0