Bump pymongo from 3.11.2 to 4.6.3 in /requirements

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 3.11.2 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@3.11.2...4.6.3)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -89,7 +89,7 @@ pyjwkest==1.4.2
     # via edx-drf-extensions
 pyjwt[crypto]==1.7.1
     # via drf-jwt
-pymongo==3.11.2
+pymongo==4.6.3
     # via edx-opaque-keys
 python-dateutil==2.8.1
     # via