fix(security): Upgrade fastmcp to v3 to address CVE-2025-69872 (#2294)

Co-authored-by: openhands <openhands@all-hands.dev>

Author: aivong-openhands

openhands-sdk/pyproject.toml

@@ -8,7 +8,7 @@ dependencies = [
     "agent-client-protocol>=0.8.1",
     "deprecation>=2.1.0",
     "fakeredis[lua]>=2.32.1",  # Explicit dependency for docket/fastmcp background tasks
-    "fastmcp>=2.11.3",
+    "fastmcp>=3.0.0",
     "filelock>=3.20.1",
     "httpx>=0.27.0",
     "litellm>=1.80.10",