Reorder/refine in the hope of speeding up CI

Author: awf

requirements-test.txt

@@ -1,7 +1,6 @@
 # PyPI doesn't like direct dependencies - see https://github.com/microsoft/microxcaling/issues/22
 
-mx @ git+https://github.com/microsoft/microxcaling
 numpy<2.0.0 # microscaling needs pytorch 2.1, which needs to be less than 2.0
 torch==2.1.0 --index-url https://download.pytorch.org/whl/cpu
-torchvision==0.16.0
-torchaudio==2.1.0
+
+mx @ git+https://github.com/microsoft/microxcaling