graphics/poppler: update to 20.10.0
Release 20.10.0:
core: * Filter out repeated forms * Implement EmbedStream::reset() * CairoOutputDev: evict just font faces owned solely by cache. * Splash: Rename Yd to Ydown, Xu to Xup, etc. * Splash: fix crash in out-of-memory situation. * Fix some undefined behaviour situation with forged files
PR: 250052
Exp-run by: antoine