onnxruntime

b32b205d - Fix error where bytes is not assigned for dynamic qgemm pack b size (#27421)

Fix error where bytes is not assigned for dynamic qgemm pack b size (#27421) ### Description Fix for dynamic qgemm pack B size. Byte assignment accidentally removed in previous commit. Which causes test failures with the following error message C++ exception with description "Dynamic QGEMM requires non-null PackedB pointer." thrown in the test body. Signed-off-by: Jonathan Clohessy <Jonathan.Clohessy@arm.com>