[poppler] Poppler 21.06.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-21.06.0.tar.xz

The tarball is signed at http://poppler.freedesktop.org/poppler-21.06.0.tar.xz.sig with my key
http://hkps.pool.sks-keyservers.net/pks/lookup?op=get&search=0xCA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7

Release 21.06.0

core:
    * Fix rendering of some extended latin1 characters in annotations. Issue #1070
    * Support some not so well formed documents with password. Issue #1083
    * Add API to get notified if the xref is reconstructed
    * Add somewhat fancier left/right signature visual representation
    * Fix crashes in malformed files
    * Minor code improvements

qt6:
    * Change some functions to return std::unique_ptr

qt5/qt6:
    * Add API to get notified if the xref is reconstructed
    * Add somewhat fancier left/right signature visual representation
    * Don't assert when trying to invert singular matrices

build system:
    * make boost opt-out if building splash


This release was brought to you by Albert Astals Cid, Hubert Figuière, Mahmoud Khalil, Oliver Sander and everyone else that filed bugs or helped with code reviews :)

Testing, patches and bug reports welcome.

Cheers,
  Albert