build(deps): Bump @mui/utils from 5.15.3 to 5.15.6

Bumps [@mui/utils](https://github.com/mui/material-ui/tree/HEAD/packages/mui-utils) from 5.15.3 to 5.15.6.
- [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/v5.15.6/packages/mui-utils)

---
updated-dependencies:
- dependency-name: "@mui/utils"
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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