Bump @babel/plugin-proposal-decorators from 7.10.5 to 7.12.1 (#15008)

Bumps [@babel/plugin-proposal-decorators](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-decorators) from 7.10.5 to 7.12.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.1/packages/babel-plugin-proposal-decorators)

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package.json

@@ -61,7 +61,7 @@
   "dependencies": {
     "@babel/core": "^7.12.3",
     "@babel/plugin-proposal-class-properties": "^7.8.3",
-    "@babel/plugin-proposal-decorators": "^7.10.5",
+    "@babel/plugin-proposal-decorators": "^7.12.1",
     "@babel/plugin-transform-react-inline-elements": "^7.12.1",
     "@babel/plugin-transform-runtime": "^7.11.5",
     "@babel/preset-env": "^7.11.5",