Update dependency @mui/lab to v6.0.0-beta.28

Author: renovate[bot]

frontends/ol-components/package.json

@@ -19,7 +19,7 @@
     "@emotion/styled": "^11.11.0",
     "@mitodl/smoot-design": "^3.3.0",
     "@mui/base": "5.0.0-beta.69",
-    "@mui/lab": "6.0.0-beta.26",
+    "@mui/lab": "6.0.0-beta.28",
     "@mui/material": "^6.4.1",
     "@mui/material-nextjs": "^6.3.1",
     "@mui/system": "^6.4.1",