chore: bump @babel/plugin-proposal-class-properties

Bumps [@babel/plugin-proposal-class-properties](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-class-properties) from 7.10.4 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-class-properties)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "@babel/core": "7.12.3",
-    "@babel/plugin-proposal-class-properties": "7.10.4",
+    "@babel/plugin-proposal-class-properties": "7.12.1",
     "@babel/polyfill": "7.11.5",
     "@babel/preset-env": "7.11.5",
     "@babel/preset-react": "7.10.4",