Merge pull request #53 from heroku/dependabot/pip/python-dotenv-1.2.1

Bump python-dotenv from 1.1.1 to 1.2.1

Author: jttyeung

requirements.txt

@@ -1,7 +1,7 @@
 mcp[client,server]==1.19.0
 fastapi==0.120.0
 uvicorn==0.38.0
-python-dotenv==1.1.1
+python-dotenv==1.2.1
 mando==0.8.2
 # --- dev / CI only -------------------------------------------------
 pytest>=8.0