Bump pymongo from 4.5.0 to 4.6.1 (#40)

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.5.0 to 4.6.1.
- [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@4.5.0...4.6.1)

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

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

requirements/requirements-test-optional.txt

@@ -1,4 +1,4 @@
 numpy==1.26.1
-pymongo==4.5.0; implementation_name=='cpython'
+pymongo==4.6.1; implementation_name=='cpython'
 redis==5.0.1
 zarr==2.16.1; platform_system!='Windows'