fix: reorder meta argument to avoid a BC

Author: samchenatti

src/mcp/client/session.py

@@ -286,8 +286,9 @@ async def call_tool(
         name: str,
         arguments: dict[str, Any] | None = None,
         read_timeout_seconds: timedelta | None = None,
-        meta: dict[str, Any] | None = None,
         progress_callback: ProgressFnT | None = None,
+        *,
+        meta: dict[str, Any] | None = None,
     ) -> types.CallToolResult:
         """Send a tools/call request with optional progress callback support."""