CLSA-2026-1773160910 postgresql: Fix of 3 CVEs

CVE-2026-2004: require superuser to install non-built-in selectivity estimators and harden intarray intmatchsel against wrong operator type - CVE-2026-2005: fix heap buffer overflow in pgcrypto PGP public-key decryption by validating session key length - CVE-2026-2006: fix multibyte character...