Update dependency @babel/core to v7.12.3 (#752)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package-lock.json

@@ -20,7 +20,7 @@
         "typescript": "4.0.3"
     },
     "devDependencies": {
-        "@babel/core": "7.12.1",
+        "@babel/core": "7.12.3",
         "@babel/plugin-proposal-nullish-coalescing-operator": "7.12.1",
         "@babel/plugin-proposal-optional-chaining": "7.12.1",
         "@babel/preset-env": "7.12.1",