[ Reason ]

I've prepared a dovecot upload for trixie to ship several bug fixes
backported from newer upstream releases.  In all cases, the fixes are
present in versions included in sid and forky.  In all cases, the bug
submitters have confirmed that the fix resolves the issue as expected.

Note that this change would supersede the dovecot/1:2.4.1+dfsg1-6+deb13u7
currently in the security archive and s-p-u.

[ Impact ]

Several user-reported bugs will remain unfixed.

[ Tests ]

Upstream's test suite and autopkgtest all runs successfully.  The bug
submitters have performed manual validation to confirm that the bugs are
indeed fixed.

Additionally, the upload includes a backported autopkgtest to validate
gssapi authentication to increase coverage.  While none of the bugfixes
directly impact gssapi authentication, the additional coverage helps protect
against future regressions.

[ Risks ]

Two of the three changes were simple cherry-picks from upstream.  However,
the fix for #1151242 does not apply cleanly because of changes to
surrounding code in the interim.  Consequently I had to reimplement the
equivalent change against trixie's code.  Diverging from upstream always
brings some additional risk, but because the change is entirely structural
and does not introduce any long-term divergence, I don't think this will be
a problem.

[ Checklist ]
  [x] *all* changes are documented in the d/changelog
  [x] I reviewed all changes and I approve them
  [x] attach debdiff against the package in (old)stable
  [x] the issue is verified as fixed in unstable

[ Changes ]
 dovecot (1:2.4.1+dfsg1-6+deb13u8) trixie; urgency=medium
 .
   * [28e353e] dovecot-sieve: sievec fails to resolve :global/:before/:after includes
     (Closes: #1151164)
   * [f644578] fix dovecot-imapd: IMAP parser error on APPEND with UTF8=ACCEPT and LITERAL+
     (Closes: #1151389)
   * [cff13fe] config: Fix delaying errors for SET_FILE type (Closes: #1151242)
   * [638e901] backport gssapi autopkgtest
   * [c95ad64] salsa-ci: disable uscan test