Bump axios from 0.19.0 to 0.21.1 in /app

Bumps [axios](https://github.com/axios/axios) from 0.19.0 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@v0.19.0...v0.21.1)

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

Author: dependabot[bot]

app/package-lock.json

@@ -13,7 +13,7 @@
         "@fortawesome/free-solid-svg-icons": "5.4.2",
         "@fortawesome/vue-fontawesome": "0.1.2",
         "@sentry/browser": "4.3.0",
-        "axios": "0.19.0",
+        "axios": "0.21.1",
         "i": "0.3.6",
         "lodash": "4.17.15",
         "npm": "6.13.6",