Bump novella from 0.2.5 to 0.2.6

Bumps [novella](https://github.com/NiklasRosenstein/novella) from 0.2.5 to 0.2.6.
- [Commits](NiklasRosenstein/novella@0.2.5...0.2.6)

---
updated-dependencies:
- dependency-name: novella
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/requirements.txt

@@ -1,4 +1,4 @@
 mkdocs
 mkdocs-material
 pydoc-markdown==4.7.0
-novella==0.2.5
+novella==0.2.6