build(deps): bump python-dotenv in /python/sklearnserver

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.0 to 1.2.2.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.1.0...v1.2.2)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.2
  dependency-type: indirect
...

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Author: dependabot[bot]