crypto/x509: excessive resource consumption in printing error string for host certificate validation (CVE-2025-61729) [1.25 backport]

[gopherbot]

@nicholashusin requested issue #76445 to be considered for backport to the next 1.25 minor release.

@gopherbot please open backport issues for this security fix

[gopherbot]

Change https://go.dev/cl/725800 mentions this issue: [release-branch.go1.25] crypto/x509: prevent HostnameError.Error() from consuming excessive resource

[gopherbot]

Closed by merging CL 725800 (commit f7bce4b) to release-branch.go1.25.