Bump pymongo from 3.12.3 to 4.6.0

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 3.12.3 to 4.6.0.
- [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@3.12.3...4.6.0)

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

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

setup.py

@@ -33,7 +33,7 @@
           'google-cloud-bigquery==3.11.1',
           'pipelinewise-singer-python==1.*',
           'python-pidfile==3.0.0',
-          'pymongo==3.12.3',
+          'pymongo==4.6.0',
           'tzlocal>=2.0,<4.1',
           'slackclient==2.9.4',
           'sqlparse==0.4.4',