Fix pyre failure in ARM tests (#7979)

Summary: Fix a pyre failure by ignoring it. Looking at the source, it's not trivial to fix this typecheck due to the way kwargs work, so I'm just going to add an ignore.

Differential Revision: D68737338

Author: GregoryComer

backends/arm/operator_support/to_copy_support.py

@@ -125,6 +125,7 @@ def is_node_supported(self, node: fx.Node, tosa_spec: TosaSpecification) -> bool
         # Check dim_order (to_dim_order_copy)
         if "dim_order" in node.kwargs:
             dim_order = node.kwargs["dim_order"]
+            # pyre-ignore[6]
             if dim_order != list(range(len(dim_order))):
                 logger.info(
                     f"Argument {dim_order=} is not supported for "