MNT: Address deprecation warning in CI

	Passing `palette` without assigning `hue` is deprecated
	and will be removed in v0.14.0. Assign the `x` variable
	to `hue` and set `legend=False` for the same effect.

Author: DimitriPapadopoulos

niworkflows/viz/plots.py

@@ -947,10 +947,12 @@ def confounds_correlation_plot(
         data=gscorr,
         x='index',
         y=reference,
+        hue='index',
         ax=ax1,
         order=gs_descending,
         palette='Reds_d',
         saturation=0.5,
+        legend=False,
     )
 
     ax1.set_xlabel('Confound time series')