fix: upgrade @mui/material from 5.11.8 to 5.15.7

Snyk has created this PR to upgrade @mui/material from 5.11.8 to 5.15.7.

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

See this project in Snyk:
https://app.snyk.io/org/etherspot/project/f7e6e9a0-4639-49bf-9fba-ed78feffb9ec?utm_source=github&utm_medium=referral&page=upgrade-pr