chore(deps): bump waitress from 2.1.2 to 3.0.1 in /docs (#220)

Bumps [waitress](https://github.com/Pylons/waitress) from 2.1.2 to 3.0.1.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/main/CHANGES.txt)
- [Commits](Pylons/waitress@v2.1.2...v3.0.1)

---
updated-dependencies:
- dependency-name: waitress
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -94,7 +94,7 @@ tornado==6.4.1
     #   livereload
 urllib3==1.26.19
     # via requests
-waitress==2.1.2
+waitress==3.0.1
     # via webtest
 webob==1.8.8
     # via webtest