Merge branch '19977-max-nesting-depth-5-stylelint' into 'master'

Set max-nesting-depth to 5 in stylelint

See merge request gitlab-org/gitlab!56459

.stylelintrc

@@ -13,7 +13,7 @@
    ],
    "rules":{
       "max-nesting-depth": [
-         6,
+         5,
          {
             "ignoreAtRules":[
                "each",