fix(deps): use blockly 12.3 beta

Author: cwillisf

package-lock.json

@@ -34,7 +34,7 @@
   "dependencies": {
     "@blockly/continuous-toolbox": "^7.0.1",
     "@blockly/field-colour": "^6.0.3",
-    "blockly": "^12.2.0"
+    "blockly": "12.3.0-beta.0"
   },
   "config": {
     "commitizen": {