fix: upgrade @mui/material from 5.14.6 to 5.14.12

Snyk has created this PR to upgrade @mui/material from 5.14.6 to 5.14.12.

See this package in npm:
https://www.npmjs.com/package/@mui/material

See this project in Snyk:
https://app.snyk.io/org/johanbook/project/dd654f93-e3f4-424b-8671-a75290611497?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot