chore(deps): update dependency jeboehm/mailserver-admin to v2.1.21

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
jeboehm/mailserver-admin	patch	2.1.20 -> 2.1.21

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Release Notes

jeboehm/mailserver-admin (jeboehm/mailserver-admin)

### [`v2.1.21`](https://redirect.github.com/jeboehm/mailserver-admin/releases/tag/2.1.21) [Compare Source](https://redirect.github.com/jeboehm/mailserver-admin/compare/2.1.20...2.1.21) ##### [2.1.21](https://redirect.github.com/jeboehm/mailserver-admin/compare/2.1.20...2.1.21) (2024-09-03) ##### Bug Fixes - **deps:** update dependency doctrine/dbal to v4.1.1 ([a85252e](https://redirect.github.com/jeboehm/mailserver-admin/commit/a85252e7102ea9d17de05411c425912ba137922e))

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Configuration

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