Bump waitress from 2.0.0 to 2.1.2 in /template

Bumps [waitress](https://github.com/Pylons/waitress) from 2.0.0 to 2.1.2.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/v2.1.2/CHANGES.txt)
- [Commits](Pylons/waitress@v2.0.0...v2.1.2)

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

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

Author: dependabot[bot]

template/requirements.txt

@@ -83,7 +83,7 @@ tinyaes==1.0.1
 typing-extensions==3.7.4.3
 tzlocal==2.1
 urllib3==1.26.2
-waitress==2.0.0
+waitress==2.1.2
 Werkzeug==1.0.1
 whichcraft==0.6.1
 wrapt==1.12.1