Bump python-dotenv from 1.0.0 to 1.2.2

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.0.0 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@v1.0.0...v1.2.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ flask==3.0.0
 flask-sqlalchemy==3.1.1
 flask-migrate==4.0.5
 aiohttp==3.10.11
-python-dotenv==1.0.0
+python-dotenv==1.2.2
 
 # --- ML/DL Frameworks (Updated) ---
 torch==2.6.0  # Updated from 2.2.0 (PR #169)