Emails don't render certain things right

[Gepardgame]

Current Behavior

Emails that are being sent from the server don't render certain things right, like & -> & and also some things not at all, like §.

Steps to Reproduce

1. Change the Test notification under resources/v1/NotificationPublisher in the function with Path "test/smtp", to include &, §, etc.
2. Send the email under administration > email >send test Email
3. Look at your inbox

Expected Behavior

Tat the email renders this symbols right.

Dependency-Track Version

4.11.7

Dependency-Track Distribution

Executable WAR

Database Server

H2

Database Server Version

No response

Browser

N/A

Checklist

• I have read and understand the contributing guidelines
• I have checked the existing issues for whether this defect was already reported

[github-actions]

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