STY: Use set_theme instead of set to set seaborn properties

Use `set_theme` instead of `set` to set searborn properties

Fixes:
```
Function `set` is deprecated in favor of `set_theme`
```

raised by the IDE.

Author: jhlegarreta

nireports/reportlets/nuisance.py

@@ -1111,7 +1111,7 @@ def plot_raincloud(
     gs = GridSpec(1, 1)
     ax = plt.subplot(gs[0, 0])
 
-    sns.set(style="white", font_scale=2)
+    sns.set_theme(style="white", font_scale=2)
 
     x = feature
     y = group_name