Bump waitress from 1.4.4 to 3.0.1

Bumps [waitress](https://github.com/Pylons/waitress) from 1.4.4 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@v1.4.4...v3.0.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -181,7 +181,7 @@ pycparser==2.20
 pyOpenSSL==20.0.0
 uk-postcode-utils==1.1
 unicode-slugify==0.1.1
-waitress==1.4.4
+waitress==3.0.1
 
 
 #necessary to process unicode csv files for ZA elections data