v1.23.6-rc.2

Bugfixes:

- #7638: favicon not working Firefox & derivative browsers
- #8899: Omitting %s from LDAP bind DN sends corrupted bind DN string to LDAP server
- #8920: Untrusted device should be disallowed from being an introducer

Other issues:

- #8897: v1.23.5-rc.1 / v1.23.5: Missing sha1sum.txt.asc & sha256sum.txt.asc
- #8898: v1.23.5-rc.1: Missing .debs for i386, armel, armhf
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