Import Debian changes 4.96-15+deb12u1

exim4 (4.96-15+deb12u1) bookworm; urgency=medium
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  * 75_42-Fix-run-arg-parsing.patch (From upstream GIT master, backported by
    Bryce Harrington for Ubuntu):  Fix argument parsing for ${run } expansion.
    Previously, when an argument included a close-brace character (eg. it
    itself used an expansion) an error occurred. Closes: #1025420
  * 75_68-Fix-srs_encode-.-for-mod-1024-day-zero.patch from upstream GIT
    master:  Fix ${srs_encode ..}. Previously it would give a bad result for
    one day every 1024 days.
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exim4 (4.96-15) unstable; urgency=medium
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  * Pull from upstream GIT master:
    + 75_70-Fix-variable-initialisation-in-smtp-transport.-Bug-2.patch
      Fix a crash in the smtp transport.
      https://bugs.exim.org/show_bug.cgi?id=2996