crypto/x509: TLS validation fails for FQDNs with trailing dot [1.25 backport]

[gopherbot]

@rolandshoemaker requested issue #75828 to be considered for backport to the next 1.25 minor release.

@gopherbot please open backport issues for this, this fixes significant breakage.

[gopherbot]

Change https://go.dev/cl/710677 mentions this issue: [release-branch.go1.25] crypto/x509: rework fix for CVE-2025-58187

[gopherbot]

Closed by merging CL 710677 (commit e05b2c9) to release-branch.go1.25.