fix(deps): update dependency scratch-paint to v4.0.18

Author: renovate[bot]

packages/scratch-gui/package.json

@@ -118,7 +118,7 @@
     "scratch-audio": "2.0.241",
     "scratch-blocks": "1.1.224",
     "scratch-l10n": "6.0.61",
-    "scratch-paint": "4.0.3",
+    "scratch-paint": "4.0.18",
     "scratch-render-fonts": "1.0.238",
     "scratch-storage": "4.1.10",
     "startaudiocontext": "1.2.1",