CLSA-2026-1769679566 gnupg2: Fix of CVE-2025-68973

CVE-2025-68973: fix out-of-bounds write in armorfilter function by correcting index variable increments...

ALPINE-CVE-2025-68973

In GnuPG before 2.4.9, armorfilter in g10/armor.c has two increments of an index variable where one is intended, leading to an out-of-bounds write for crafted input. For ExtendedLTS, 2.2.51 and later are fixed versions...