Bump pymongo from 4.6.2 to 4.7.3

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.6.2 to 4.7.3.
- [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@4.6.2...4.7.3)

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

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

requirements.txt

@@ -5,7 +5,7 @@ flask[async]==3.0.2
 gunicorn==22.0.0
 opengsq==3.1.0
 psycopg2-binary==2.9.9
-pymongo==4.6.2
+pymongo==4.7.3
 python-dotenv==1.0.1
 pywin32==306;platform_system=="Windows"
 typing-extensions==4.8.0;python_version<"3.10"