build(deps-dev): bump axios from 0.20.0 to 0.21.2 in /backend

Bumps [axios](https://github.com/axios/axios) from 0.20.0 to 0.21.2.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v0.21.2/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.20.0...v0.21.2)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: direct:development
...

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

backend/package.json

@@ -30,7 +30,7 @@
     "@babel/preset-env": "^7.18.0",
     "@babel/register": "^7.17.7",
     "@types/gulp": "^4.0.9",
-    "axios": "^0.20.0",
+    "axios": "^0.21.2",
     "babel-plugin-relative-path-import": "^2.0.1",
     "babelify": "^10.0.0",
     "browser-pack-flat": "^3.4.2",