[stubsabot] Bump waitress to 3.0.*

Release: https://pypi.org/pypi/waitress/3.0.0
Homepage: https://github.com/Pylons/waitress
Repository: https://github.com/Pylons/waitress
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/waitress
Changelog: https://docs.pylonsproject.org/projects/waitress/en/latest/index.html#change-history
Diff: Pylons/waitress@v2.1.2...v3.0.0

Stubsabot analysis of the diff between the two releases:
 - Total lines of Python code added: 104.
 - Total lines of Python code deleted: 125.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

Note that you will need to close and re-open the PR in order to trigger CI

stubs/waitress/METADATA.toml

@@ -1,4 +1,4 @@
-version = "2.1.*"
+version = "3.0.*"
 upstream_repository = "https://github.com/Pylons/waitress"
 
 [tool.stubtest]