Update pymongo requirement from ==4.7.* to >=4.7,<4.9

Updates the requirements on [pymongo](https://github.com/mongodb/mongo-python-driver) to permit the latest version.
- [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@4.7.0...4.8.0)

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

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

setup.py

@@ -31,7 +31,7 @@
           'google-cloud-bigquery==3.11.1',
           'pipelinewise-singer-python==1.*',
           'python-pidfile==3.0.0',
-          'pymongo==4.7.*',
+          'pymongo>=4.7,<4.9',
           'tzlocal>=2.0,<4.1',
           'slackclient==2.9.4',
           'sqlparse==0.4.4',