Processed: fix missing severity

[Debian Bug Tracking System]

Processing commands for control at bugs.debian.org:

> severity 915007 serious
Bug #915007 [opensaml2] opensaml2 FTBFS with xmltooling 3
Severity set to 'serious' from 'normal'
> thanks
Stopping processing here.

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-- 
915007: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915007
Debian Bug Tracking System
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