Bump pymongo from 4.0.1 to 4.0.2 (#979)

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/mongodb/mongo-python-driver/releases)
- [Changelog](https://github.com/mongodb/mongo-python-driver/blob/4.0.2/doc/changelog.rst)
- [Commits](mongodb/mongo-python-driver@4.0.1...4.0.2)

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

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

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -10,7 +10,7 @@ azure-storage-blob==12.8.1 # pyup: ignore
 redis==4.1.4
 types-redis
 types-setuptools
-pymongo==4.0.1
+pymongo==4.0.2
 # optional test requirements
 tox==3.24.5
 coverage