Happy 1,700,000,000 UNIX timestamp!

@cynthia This broke Samba's testsuite.

No jobs will pass CI any more.

@cynthia

Bug 15520 - sid_strings test broken by unix epoch > 1700000000
https://bugzilla.samba.org/show_bug.cgi?id=15520

15520 – sid_strings test broken by unix epoch > 1700000000