build(deps): Bump @mui/styled-engine from 6.1.3 to 6.1.6 (#2533)

Bumps [@mui/styled-engine](https://github.com/mui/material-ui/tree/HEAD/packages/mui-styled-engine) from 6.1.3 to 6.1.6.
- [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/v6.1.6/packages/mui-styled-engine)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>