Bump pymongo from 4.0.1 to 4.6.3 in /test/test-app (#1519)

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.0.1 to 4.6.3.
- [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@4.0.1...4.6.3)

---
updated-dependencies:
- dependency-name: pymongo
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Nam Nguyen <nam.nguyen@mongodb.com>

Author: dependabot[bot]

test/test-app/requirements.txt

@@ -1,2 +1,2 @@
-PyMongo==4.0.1
+PyMongo==4.6.3
 dnspython==2.6.1