Bump pymongo from 4.3.3 to 4.4.0

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.3.3 to 4.4.0.
- [Release notes](https://github.com/mongodb/mongo-python-driver/releases)
- [Changelog](https://github.com/mongodb/mongo-python-driver/blob/master/doc/changelog.rst)
- [Commits](mongodb/mongo-python-driver@4.3.3...4.4.0)

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

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

requirements.txt

@@ -4,7 +4,7 @@ dnspython==2.3.0
 mysql-connector==2.2.9
 persistent==5.0
 pycparser==2.21
-pymongo==4.3.3
+pymongo==4.4.0
 six==1.16.0
 transaction==3.1.0
 zc.lockfile==3.0.post1