build(deps): Bump pymongo from 4.7.2 to 4.8.0 in /llm-server

Bumps [pymongo](https://github.com/mongodb/mongo-python-driver) from 4.7.2 to 4.8.0.
- [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@4.7.2...4.8.0)

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

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

llm-server/requirements.txt

@@ -109,7 +109,7 @@ pycparser==2.21
 pydantic==2.4.2
 pydantic_core==2.10.1
 pydub==0.25.1
-pymongo==4.7.2
+pymongo==4.8.0
 PyMySQL==1.1.1
 PyPDF2==3.0.1
 pypdf==4.0.1