Processed: fix severity of FTBFS bug

[Debian Bug Tracking System]

Processing commands for control at bugs.debian.org:

> Severity 903619 serious
Bug #903619 [haskell-language-python] haskell-language-python FTBFS build hangs.
Severity set to 'serious' from 'normal'
> Thanks
Stopping processing here.

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-- 
903619: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903619
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