Update babel monorepo

Author: renovate-bot

package.json

@@ -32,8 +32,8 @@
     "webworkers"
   ],
   "devDependencies": {
-    "@babel/core": "7.12.3",
-    "@babel/plugin-proposal-class-properties": "7.12.1",
+    "@babel/core": "7.15.0",
+    "@babel/plugin-proposal-class-properties": "7.14.5",
     "babel-eslint": "^10.1.0",
     "eslint": "7.15.0",
     "eslint-config-bliss": "5.0.0",