Bump axios from 0.21.4 to 1.6.8 in /backend

Bumps [axios](https://github.com/axios/axios) from 0.21.4 to 1.6.8.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.21.4...v1.6.8)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -28,7 +28,7 @@
     "archiver": "^5.3.1",
     "async": "^3.2.3",
     "async-mutex": "^0.4.0",
-    "axios": "^0.21.2",
+    "axios": "^1.6.8",
     "bcryptjs": "^2.4.0",
     "command-exists": "^1.2.9",
     "compression": "^1.7.4",