build(deps-dev): bump @babel/core from 7.12.3 to 7.12.10 in /frontend

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.12.3 to 7.12.10.
- [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/v7.12.10/packages/babel-core)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -20,7 +20,7 @@
   },
   "homepage": "https://github.com/mozilla/code-coverage-reports#readme",
   "devDependencies": {
-    "@babel/core": "^7.5.4",
+    "@babel/core": "^7.12.10",
     "@babel/preset-env": "^7.12.11",
     "babel-loader": "^8.0.6",
     "babel-plugin-prismjs": "^2.0.0",