Upload correlation_matrix.png with huggingface_hub

.gitattributes

@@ -37,3 +37,4 @@ vulnerability_map.png filter=lfs diff=lfs merge=lfs -text
 hotspot_coldspot_map.png filter=lfs diff=lfs merge=lfs -text
 calibration_curve.png filter=lfs diff=lfs merge=lfs -text
 ablation_heatmap.png filter=lfs diff=lfs merge=lfs -text
+correlation_matrix.png filter=lfs diff=lfs merge=lfs -text