Bump setuptools from 0.18.2 to 65.5.1 in /docs

Bumps [setuptools](https://github.com/pypa/setuptools) from 0.18.2 to 65.5.1.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/setuptools/commits/v65.5.1)

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

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Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 sphinx==3.2.1
 sphinx_bootstrap_theme==0.7.1
-setuptools==0.18.2
+setuptools==65.5.1