Import Debian changes 2.0.20-1

mosquitto (2.0.20-1) unstable; urgency=medium
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  * Team upload.
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  [ Joachim Zobel ]
  * New upstream release
    - Fix for CVE-2024-8376
  * debian/patches/2895.patch: Changes both service files now (Closes: #1036450)
  * debian/patches/2894.patch: Removed, applied by upstream
  * debian/patches/1571.patch: Removed, applied by upstream
  * Fixed reprotest build_path failure
  * Fixed 2 lintian warnings
  * Added Joachim Zobel as uploader