update mui

One bigger visible change and the product change, related to this, described here

https://git.opentalk.dev/opentalk/frontend/web/web-app/-/issues/2325#note_162162

In MUI6 some API's became deprecated. They still can be used, but will be completely removed in the MUI7. Therefore I've used the chance here and picked all the low-hanging fruits as described here.

https://mui.com/material-ui/migration/migrating-from-deprecated-apis/

Couple of things need deeper investigation, therefore separate migration tickets will be created.

Remark for QA: Please, test everything !!!

Closes #2325