Bump @mui/material from 5.15.15 to 6.1.7

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.15 to 6.1.7.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v6.1.7/packages/mui-material)

---
updated-dependencies:
- dependency-name: "@mui/material"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -20,7 +20,7 @@
     "@emotion/react": "^11.13.3",
     "@emotion/styled": "^11.11.5",
     "@esbuild-plugins/node-globals-polyfill": "^0.2.3",
-    "@mui/material": "^5.15.15",
+    "@mui/material": "^6.1.7",
     "@statisticsnorway/ssb-component-library": "^2.0.99",
     "body-parser": "^1.20.2",
     "dotenv": "^16.4.5",