[MEDIUM] Silent HTTPS proxy downgrade to cleartext

PKSA-k22t-f949-t9g6 CVE-2026-55568 GHSA-wpwq-4j6v-78m3

Affected package: guzzlehttp/guzzle

Affected version: <7.12.1

Reported by:
GitHub, FriendsOfPHP/security-advisories