maddy 0.6.3

[foxcpp]

This release does not include most changes from master branch (intended to become 0.7) and is instead based on 0.6.2.

Bugfixes

• [security] Fix authentication bypass if SASL authorization username is used (GHSA-4g76-w3xw-2x6w, CVE-2023-27582).

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This discussion was created from the release maddy 0.6.3.