[Snyk] Upgrade @mui/material from 5.15.6 to 5.15.14

[jstabenow]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade @mui/material from 5.15.6 to 5.15.14.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 8 versions ahead of your current version.
• The recommended version was released 21 days ago, on 2024-03-19.

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