Bump axios from 0.18.1 to 0.21.1 in /frontend

Bumps [axios](https://github.com/axios/axios) from 0.18.1 to 0.21.1.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v0.21.1/CHANGELOG.md)
- [Commits](axios/axios@v0.18.1...v0.21.1)

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -12,7 +12,7 @@
     "@material-ui/core": "^4.10.0",
     "@material-ui/icons": "^4.9.1",
     "@sentry/browser": "latest",
-    "axios": "^0.18.0",
+    "axios": "^0.21.1",
     "bootstrap": "4.3.1",
     "classnames": "^2.2.6",
     "emotion-theming": "^10.0.27",