poppler: Update to version 23.08.0

poppler: Update to version 23.08.0

- Update from version 23.03.0 to 23.08.0
- Update rootfile
- Changelog
    23.08.0:
        core:
         * Fix GWG 19.2 - DeviceN Overprint (White)
         * Splash: avoid bogus memory allocation size in doTilingPatternFill
         * Fix use-of-uninitialized-value in XRef
         * Fix float-cast-overflow error in Catalog
         * Cleanup gpgme backend code
         * Version symbols in poppler core
        glib:
         * Improve poppler_get_available_signing_certificates
         * Add new members to PopplerCertificateInfo
        utils:
         * pdftotext: small improvement to man page
    23.07.0:
        core:
         * Fix reading of utf8-with-bom files
         * Fix crash if CERT_ExtractPublicKey doesn't return a public key
         * Fix rendering of some malformed documents. Issue #1395
         * Allow for stream compression and compress font streams in forms
         * Remove method Hints::getPageRanges
        qt5:
         * Fix crash when overprint preview is enabled
         * Don't fail signature basics tests if backend is not configured
        qt6:
         * Fix crash when overprint preview is enabled
         * Don't fail signature basics tests if backend is not configured
        utils:
         * pdfsig: Allow showung and selecting signature backend
         * pdfsig: Describe signature dump format in manual page
        glib:
         * Add signing API
        build system:
         * zlib is now mandatory
    23.06.0:
        core:
         * CairoOutputDev: Fix crash when doing type3 rendering
         * Fix crash with unknown signature hashing algorithms
         * Add gpgme backend for signature handling
         * Windows: Fix crash when signing existing signature
         * FontInfo: Make it return proper information about font substitution
         * FontInfo: Try harder to get Type 3 font name
         * Store embedded fonts widths table in a more effective manner
         * Skip font lookup for nonprintable characters
         * Windows: Look for fonts in both windows font dir and poppler fonts dir
         * Windows: symbol.ttf is not a good Symbol font
         * Windows: Fix memory leak when looking for fonts
         * Fix crash on malformed files
        qt5:
         * Add API to allow selecting signature backend (nss or gpgme)
         * Convert embedded files to bytearray a bit smarter
        qt6:
         * Add API to allow selecting signature backend (nss or gpgme)
         * Convert embedded files to bytearray a bit smarter
    23.05.0:
        core:
         * Fix crash when filling some forms
         * Set SigFlags when signing unsigned signature
         * Add some infrastructure code to support multiple signing backends
         * Fix potential stack overflow in PostScriptFunction::parseCode
         * Fix some minor uninitialised memory reads
    23.04.0:
        core:
         * Fix memory issue when signing fails. Issue #1372
         * Internal improvements of signature related code
         * CairoOutputDev: improve type3 font rendering
         * Fix memory leak in GlobalParams::findSystemFontFileForFamilyAndStyle
        utils:
         * pdftocairo: Fix crash in some special situations
         * pdfsig: allow holes in -dump signature list
         * pdfsig: Support --help

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>