Fixed CHANGELOG for 2.1.23

[rhertogh]

PR #498 introduced an error in the changelog for v2.1.23

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#498

PR #498 introduced an error in the changelog for v2.1.23.

[what-the-diff[bot]]

PR Summary

• Add Yii2-Symfony Mailer Support This pull request adds support for the Yii2-Symfony mailer system in the MailPanel file, enhancing the integration of our project with the popular Yii2 framework and improving email management capabilities.

[samdark]

Thanks.