Update dependency @mui/lab to v6.0.0-beta.15

Author: renovate[bot]

frontends/ol-components/package.json

@@ -17,7 +17,7 @@
     "@emotion/react": "^11.11.1",
     "@emotion/styled": "^11.11.0",
     "@mui/base": "5.0.0-beta.61",
-    "@mui/lab": "6.0.0-beta.14",
+    "@mui/lab": "6.0.0-beta.15",
     "@mui/material": "^6.1.6",
     "@mui/material-nextjs": "^6.1.6",
     "@mui/system": "^6.1.6",