[CRITICAL] Security fix for Flow Swift Mailer package

PKSA-93p9-36m7-p3r4 GHSA-rq6q-hjvh-5mwh

Affected version: >=4.1.0,<4.1.99|>=5.4.0,<5.4.5

Reported by:
GitHub, FriendsOfPHP/security-advisories