Bump greenlet from 3.3.1 to 3.4.0

Bumps [greenlet](https://github.com/python-greenlet/greenlet) from 3.3.1 to 3.4.0.
- [Changelog](https://github.com/python-greenlet/greenlet/blob/master/CHANGES.rst)
- [Commits](python-greenlet/greenlet@3.3.1...3.4.0)

---
updated-dependencies:
- dependency-name: greenlet
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

constraints.txt

@@ -9,7 +9,7 @@ chardet==5.2.0
 charset-normalizer==3.4.4
 coverage==7.9.2
 gevent==25.8.1
-greenlet==3.3.1
+greenlet==3.4.0
 h11==0.16.0
 httpcore==1.0.9
 httpx==0.28.1