CLSA-2026-1776329620 glib2: Fix of 6 CVEs

CVE-2026-1489: fix integer overflow in Unicode case conversion functions - CVE-2026-1484: fix integer overflow in GLib Base64 encoding - CVE-2025-14512: fix integer overflow in escapebytestring for byte strings with many invalid characters - CVE-2026-1485: fix buffer underflow in content type...