token response (auth and validation) return null unix time as token issued_at

[gtema]

New authentication and token validation (both returning expanded token) return 1970-01-01 as the token creation time

$> osc auth show

│...
│ issued_at  ┆ 1970-01-01T00:00:00Z        │
│ expires_at ┆ 2026-07-30T13:22:29.114442Z |  
│...