[Pkg-libvirt-maintainers] Processed: Update to severity

[Debian Bug Tracking System]

Processing control commands:

> severity -1 important
Bug #969876 [src:virt-top] virt-top: autopkgtest should be marked superficial
Severity set to 'important' from 'serious'

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969876: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=969876
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