Processed: bump severity of poppler build-depends

[Debian Bug Tracking System]

Processing control commands:

> severity -1 important
Bug #1026040 [pdftoipe] pdftoipe: Fix build with Poppler >= 22.09
Severity set to 'important' from 'wishlist'

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1026040: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1026040
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