Bump greenlet from 2.0.2 to 3.0.3

Bumps [greenlet](https://github.com/python-greenlet/greenlet) from 2.0.2 to 3.0.3.
- [Changelog](https://github.com/python-greenlet/greenlet/blob/master/CHANGES.rst)
- [Commits](python-greenlet/greenlet@2.0.2...3.0.3)

---
updated-dependencies:
- dependency-name: greenlet
  dependency-type: indirect
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -49,7 +49,7 @@ flask==1.1.4
     # via
     #   -r requirements.in
     #   excalibur-py
-greenlet==2.0.2
+greenlet==3.0.3
     # via sqlalchemy
 itsdangerous==1.1.0
     # via flask