Bump readthedocs-sphinx-ext from 2.1.9 to 2.2.5

Bumps [readthedocs-sphinx-ext](https://github.com/readthedocs/readthedocs-sphinx-ext) from 2.1.9 to 2.2.5.
- [Commits](readthedocs/readthedocs-sphinx-ext@2.1.9...2.2.5)

---
updated-dependencies:
- dependency-name: readthedocs-sphinx-ext
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -1,4 +1,4 @@
 sphinx==5.3.0
-readthedocs-sphinx-ext==2.1.9 # ??
+readthedocs-sphinx-ext==2.2.5 # ??
 sphinx-rtd-theme
 myst-parser==0.18.1