CLSA-2026-1775210556 ghostscript: Fix of 4 CVEs

CVE-2025-27830: fix potential buffer overflow with DollarBlend in font serialization - CVE-2025-27831: prevent Unicode decoding overrun in txtwrite/docxwrite devices - CVE-2025-27835: fix confusion between bytes and shorts in glyph to Unicode conversion - CVE-2025-27836: fix potential print...