fix: upgrade react-admin from 3.4.2 to 3.5.3

Snyk has created this PR to upgrade react-admin from 3.4.2 to 3.5.3.

See this package in NPM:
https://www.npmjs.com/package/react-admin

See this project in Snyk:
https://app.snyk.io/org/gerdesque/project/acd9730a-8dd5-4c49-8d23-b4831e53dcac?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -40,7 +40,7 @@
     "ra-data-json-server": "^3.4.1",
     "ra-language-german": "^2.1.2",
     "react": "16.13.1",
-    "react-admin": "^3.4.2",
+    "react-admin": "^3.5.3",
     "react-dom": "16.13.1",
     "react-router": "^5.1.2",
     "react-router-dom": "^5.1.2"