Bump axios from 0.17.1 to 0.21.1 in /client

Bumps [axios](https://github.com/axios/axios) from 0.17.1 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](https://github.com/axios/axios/compare/v0.17.1...v0.21.1)

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

client/package.json

@@ -20,7 +20,7 @@
     "@types/react-dom": "^16.0.3",
     "@types/react-router-dom": "^4.2.3",
     "autoprefixer": "^7.2.4",
-    "axios": "^0.17.1",
+    "axios": "^0.21.1",
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.2",
     "babel-plugin-add-module-exports": "^0.2.1",