Regenerate expired certificates in subjalt.jks for HostnameVerificationTest (#2965)

Four of the five certificates in subjalt.jks (subjaltmatch, subjaltnomatch,
nosubjaltcnmatch, nosubjaltcnnomatch) expired on December 15, 2024, causing
HostnameVerificationTest and HostnameVerificationDeprecatedTest to fail.

Regenerated all four certificates with the same DN and SAN values,
using 10-year validity (until 2036). The fifth certificate
(nosubjaltcnmatchwildcard) remains valid until 2028 and was not changed.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: gnodet