chore: Use forked plane-sdk with endpoint fix

Temporarily using forked plane-sdk from:
https://github.com/egeorcun/plane-python-sdk

This fixes the /work-items -> /issues endpoint issue.
Will revert to official SDK once PR makeplane#18 is merged:
makeplane/plane-python-sdk#18

Author: Ege Orcun

pyproject.toml

@@ -13,7 +13,7 @@ keywords = ["mcp", "plane", "fastmcp", "ai", "automation"]
 
 dependencies = [
     "fastmcp==2.14.1",
-    "plane-sdk==0.2.2",
+    "plane-sdk @ git+https://github.com/egeorcun/plane-python-sdk.git@main",
     "py-key-value-aio[redis]==0.3.0",
     "mcp==1.24.0",
 ]