Bump setuptools from 49.6 to 65.5.1 in /docs (#158)

Bumps [setuptools](https://github.com/pypa/setuptools) from 49.6 to 65.5.1.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/CHANGES.rst)
- [Commits](pypa/setuptools@v49.6.0...v65.5.1)

---
updated-dependencies:
- dependency-name: setuptools
  dependency-type: direct:production
...

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

docs/requirements.rtd.txt

@@ -30,4 +30,4 @@ seaborn==0.10.1
 nbsphinx==0.8.5
 jinja2==2.11.3
 nbsphinx_link==1.3.0
-setuptools==49.6
+setuptools==65.5.1