Update dependency @babel/core to v7.12.9

Author: renovate-bot

package.json

@@ -70,7 +70,7 @@
     "babel-core": "7.0.0-bridge.0"
   },
   "devDependencies": {
-    "@babel/core": "7.12.8",
+    "@babel/core": "7.12.9",
     "@babel/plugin-proposal-class-properties": "7.12.1",
     "@babel/plugin-proposal-decorators": "7.12.1",
     "@babel/plugin-proposal-export-namespace-from": "7.12.1",