fix: use UTC calendar for JDBC timestamp reads#843
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Fixes timezone-dependent authentication bypass caused by JDBC getTimestamp() interpreting SQL DATETIME values using the JVM default timezone.
On non-UTC JVM deployments, suspended users could authenticate because suspendedUntil timestamps were interpreted incorrectly and compared against the wrong epoch time.
This PR standardizes JDBC timestamp reads using a shared UTC Calendar.
Changes:
Added shared UTC JDBC calendar utility
Suspended users are now correctly rejected during authentication regardless of JVM timezone.