Regenerate certificates for qsslserver auto-test

self-signed certificates in this auto-test have 'not valid after' date in a distant future, so distant (year 9999, month 12, day 31, hour 23, minutes 59) that our date time parser, which we use in 'generic' code (== SecureTransport/SChannel) returns 'invalid date', thus failing qsslserver auto-test. Makes sense to re-create those certificates with not so extreme data (even if it is still several thousands years after 2024).