build(deps-dev): bump @babel/plugin-proposal-decorators (#807)

Bumps [@babel/plugin-proposal-decorators](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-decorators) from 7.8.3 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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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

amundsen_application/static/package.json

@@ -38,7 +38,7 @@
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.11.6",
     "@babel/plugin-proposal-class-properties": "^7.12.1",
-    "@babel/plugin-proposal-decorators": "^7.0.0",
+    "@babel/plugin-proposal-decorators": "^7.12.1",
     "@babel/plugin-proposal-do-expressions": "^7.10.4",
     "@babel/plugin-proposal-export-default-from": "^7.10.4",
     "@babel/plugin-proposal-export-namespace-from": "^7.12.1",