Bump axios from 0.18.0 to 0.21.1 in /client

Bumps [axios](https://github.com/axios/axios) from 0.18.0 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@v0.18.0...v0.21.1)

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

Author: dependabot[bot]

client/package-lock.json

@@ -11,7 +11,7 @@
     "eject": "react-scripts eject"
   },
   "dependencies": {
-    "axios": "^0.18.0",
+    "axios": "^0.21.1",
     "jump.js": "^1.0.2",
     "react": "^16.5.2",
     "react-dom": "^16.5.2",