[HIGH] Fix failure to strip Authorization header on HTTP downgrade

PKSA-2z36-j4q9-rsfy CVE-2022-31043 GHSA-w248-ffj2-4v5q

Affected package: guzzlehttp/guzzle

Affected version: >=7,<7.4.4|>=4,<6.5.7

Reported by:
GitHub, FriendsOfPHP/security-advisories