[MEDIUM] Fixed the user refreshing to check the identity by primary key instead of username

PKSA-9y6m-pqt9-vrds GHSA-8wx3-8m4x-g5h4

Affected package: friendsofsymfony/user-bundle

Affected version: >=1.2.0,<1.2.1

Reported by:
FriendsOfPHP/security-advisories, GitHub