build: bump python-dotenv from 1.1.1 to 1.2.2 in /src/mcp_server

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.1 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@v1.1.1...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]

src/mcp_server/pyproject.toml

@@ -17,7 +17,7 @@ dynamic = ["version"]
 dependencies = [
   "fastmcp==3.2.0",
   "uvicorn[standard]==0.38.0",
-  "python-dotenv==1.1.1",
+  "python-dotenv==1.2.2",
   "azure-identity==1.19.0",
   "pydantic==2.11.7",
   "pydantic-settings==2.6.1",