Bump python-dotenv from 1.1.1 to 1.2.1

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.1.1...v1.2.1)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 mcp[client,server]==1.18.0
 fastapi==0.119.1
 uvicorn==0.38.0
-python-dotenv==1.1.1
+python-dotenv==1.2.1
 mando==0.8.2
 # --- dev / CI only -------------------------------------------------
 pytest>=8.0