fix: Add type to tool_input (strands-agents#854)

Author: Unshure

src/strands/tools/decorator.py

@@ -447,7 +447,7 @@ async def stream(self, tool_use: ToolUse, invocation_state: dict[str, Any], **kw
         """
         # This is a tool use call - process accordingly
         tool_use_id = tool_use.get("toolUseId", "unknown")
-        tool_input = tool_use.get("input", {})
+        tool_input: dict[str, Any] = tool_use.get("input", {})
 
         try:
             # Validate input against the Pydantic model