fix(deps): update dependency scratch-paint to v3

Author: renovate[bot]

package-lock.json

@@ -85,7 +85,7 @@
     "scratch-audio": "^2.0.0",
     "scratch-blocks": "^1.1.6",
     "scratch-l10n": "^5.0.0",
-    "scratch-paint": "^2.2.151",
+    "scratch-paint": "^3.0.0",
     "scratch-render": "^2.0.0",
     "scratch-render-fonts": "^1.0.2",
     "scratch-storage": "^2.3.1",