docker-mailserver/docker-mailserver v13.3.1

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1. Diff to last release: v13.3.0...v13.3.1
2. Our Changelog

What's Changed

This is a patch release fixing two important bugs in v13.3.0:

1. Dovecot: We now restrict the authentication mechanisms for PassDB configurations we manage (oauth2, passwd-file, ldap) (#3812). This prevents misleading auth failures from attempting to authenticate against a PassDB with incompatible auth mechanisms. When the new OAuth2 feature was enabled, it introduced false-positives with logged auth failures which triggered Fail2Ban to ban the IP.
2. Rspamd: We now ensure correct ownership (_rspamd:_rspamd) for the Rspamd DKIM directory and files (/tmp/docker-mailserver/rspamd/dkim/)

What's Changed

• fix(typo): comment on mailserver.env by @JamBalaya56562 in #3799
• fix: Ensure correct ownership for the Rspamd DKIM directory by @polarathene in #3813
• fix: Correctly support multiple Dovecot PassDBs by @polarathene in #3812
• docs: Minor revisions to Dovecot Sieve page by @polarathene in #3811
• chore: Raise awareness of v13 breaking change better (Proxy Protocol) by @polarathene in #3818