[poppler] update to 26.4.0

[brunvonlope]

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version, or no changes were necessary.
• Any fixed CI baseline and CI feature baseline entries are removed from that file, or no entries needed to be changed.
• All patch files in the port are applied and succeed.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.

[BillyONeal]

Looks like we need to patch gdal to take this update:

D:\b\gdal\src\v3.12.3-ec3e82ce2f.clean\frmts\pdf\pdfobject.cpp(1125): error C2440: 'initializing': cannot convert from 'const std::string' to 'const GooString *'
D:\b\gdal\src\v3.12.3-ec3e82ce2f.clean\frmts\pdf\pdfobject.cpp(1125): note: No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

[brunvonlope]

Looks like we need to patch gdal to take this update:

Yeah. This is the same failure that is affecting MSYS2: msys2/MINGW-packages#28815 (comment)