Upgrade to React-Admin 4 (#332)

Change-Id: Ia03486edfd934438580e614af754a0966f6fd6e3

package.json

@@ -18,12 +18,9 @@
     "eslint-config-react-app": "^7.0.1",
     "eslint-plugin-prettier": "^4.2.1",
     "jest-fetch-mock": "^3.0.3",
-    "prettier": "^2.2.0",
-    "ra-test": "^3.19.12"
+    "prettier": "^2.2.0"
   },
   "dependencies": {
-    "@emotion/react": "^11.11.1",
-    "@emotion/styled": "^11.10.6",
     "@mui/icons-material": "^5.14.19",
     "@mui/material": "^5.14.8",
     "@mui/styles": "5.14.10",
@@ -34,7 +31,7 @@
     "ra-language-german": "^3.13.4",
     "ra-language-italian": "^3.13.1",
     "react": "^17.0.0",
-    "react-admin": "^3.19.12",
+    "react-admin": "^4.16.9",
     "react-dom": "^17.0.2",
     "react-scripts": "^5.0.1"
   },