Issue #3038562 by alexpott, markconroy: Update stylelint to 9.10.1

core/modules/layout_builder/css/layout-builder.css

 .layout-builder {
   background-color: #fff;
   outline: 3px solid #2f91da;
-  padding: 1.5em 1.5em .5em;
+  padding: 1.5em 1.5em 0.5em;
   outline-offset: -3px;
 }
 

core/package.json

@@ -41,7 +41,7 @@
     "mkdirp": "^0.5.1",
     "nightwatch": "^0.9.20",
     "prettier": "^1.14.0",
-    "stylelint": "^9.1.1",
+    "stylelint": "^9.10.1",
     "stylelint-checkstyle-formatter": "^0.1.1",
     "stylelint-config-standard": "^18.2.0",
     "stylelint-no-browser-hacks": "^1.1.0"