chore: use blockly v12.3.1 for local development (#740)

Author: maribethb

package-lock.json

@@ -63,7 +63,7 @@
     "@types/p5": "^1.7.6",
     "@typescript-eslint/eslint-plugin": "^6.7.2",
     "@typescript-eslint/parser": "^6.7.2",
-    "blockly": "12.3.0",
+    "blockly": "12.3.1",
     "chai": "^5.2.0",
     "eslint": "^8.49.0",
     "eslint-config-google": "^0.14.0",