Bump pymongo from 3.11.4 to 3.12.0 (#796)

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 3.11.4 to 3.12.0.
- [Release notes](https://github.com/mongodb/mongo-python-driver/releases)
- [Changelog](https://github.com/mongodb/mongo-python-driver/blob/3.12.0/doc/changelog.rst)
- [Commits](mongodb/mongo-python-driver@3.11.4...3.12.0)

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

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

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

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -9,7 +9,7 @@ ipytree==0.2.1
 azure-storage-blob==12.8.1 # pyup: ignore
 redis==3.5.3
 types-redis
-pymongo==3.11.4
+pymongo==3.12.0
 # optional test requirements
 tox==3.24.1
 coverage