Update material-ui to latest packages

package.json

@@ -30,9 +30,9 @@
   ],
   "repository": "https://github.com/ProjectMirador/mirador",
   "dependencies": {
-    "@material-ui/core": "^4.2.2",
-    "@material-ui/icons": "^4.2.1",
-    "@material-ui/lab": "^4.0.0-alpha.23",
+    "@material-ui/core": "^4.7.2",
+    "@material-ui/icons": "^4.5.1",
+    "@material-ui/lab": "^4.0.0-alpha.28",
     "@researchgate/react-intersection-observer": "^1.0.0",
     "classnames": "^2.2.6",
     "clsx": "^1.0.4",