update mcp version in plugin's requirements.txt (#14)

Missed updating this version when updating the `mcp` version in the
resolve.

Author: tdyas

src/python/shoalsoft/pants_mcp_plugin/requirements.txt

@@ -1,2 +1,2 @@
-mcp[cli]==1.11.0
+mcp[cli]==1.14.0
 anyio>=4.5