Bump axios from 0.19.2 to 0.21.1 in /client

Bumps [axios](https://github.com/axios/axios) from 0.19.2 to 0.21.1.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](axios/axios@v0.19.2...v0.21.1)

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

client/package.json

@@ -6,7 +6,7 @@
     "@testing-library/jest-dom": "^4.2.4",
     "@testing-library/react": "^9.5.0",
     "@testing-library/user-event": "^7.2.1",
-    "axios": "^0.19.2",
+    "axios": "^0.21.1",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "3.4.1"