Bump waitress from 2.1.1 to 2.1.2 in /cuchem (#158)

Bumps [waitress](https://github.com/Pylons/waitress) from 2.1.1 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@v2.1.1...v2.1.2)

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

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

cuchem/requirements.txt

@@ -13,7 +13,7 @@ autopep8==1.5.4
 protobuf==3.14.0
 chembl_webresource_client==0.10.2
 matplotlib==3.3.4
-waitress==2.1.1
+waitress==2.1.2
 flask-restplus==0.13.0
 locust==1.4.3
 hydra-core==1.1.1