chore: Upgrades babel and related (#664)

* chore: upgrades babel deps

* chore: updates deprecated class properties

See the @babel/plugin-proposal-class-properties
package on npm for reference

Author: tuliomir

babel.config.js

@@ -14,6 +14,6 @@ module.exports = {
   ],
   plugins: [
     "@babel/plugin-transform-async-generator-functions",
-    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-transform-class-properties",
   ],
 };