Bump axios from 0.19.2 to 0.21.1 in /client (#53)

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/v0.21.1/CHANGELOG.md)
- [Commits](axios/axios@v0.19.2...v0.21.1)

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client/package-lock.json

@@ -9,7 +9,7 @@
     "@material-ui/styles": "^4.10.0",
     "@testing-library/react": "^9.5.0",
     "@testing-library/user-event": "^7.2.1",
-    "axios": "^0.19.2",
+    "axios": "^0.21.1",
     "eslint-config-jest-enzyme": "^7.1.2",
     "formik": "^2.1.4",
     "formik-material-ui": "^2.0.1",