Bump pymongo from 3.12.0 to 4.3.3 (#24)

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 3.12.0 to 4.3.3.
- [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@3.12.0...4.3.3)

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

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

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

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@ flask-sqlalchemy==2.4.3
 itsdangerous==1.1.0
 jinja2==3.1.2
 markupsafe==2.1.1
-pymongo==3.12.0
+pymongo==4.3.3
 pytz==2020.1
 six==1.16.0
 sqlalchemy==1.4.44