Merge pull request #60 from heroku/dependabot/pip/mcp-clientserver--1.21.1

Bump mcp[client,server] from 1.21.0 to 1.21.1

Author: jttyeung

requirements.txt

@@ -1,4 +1,4 @@
-mcp[client,server]==1.21.0
+mcp[client,server]==1.21.1
 fastapi==0.121.1
 uvicorn==0.38.0
 python-dotenv==1.2.1