Security update for aws-iam-authenticator

This update for aws-iam-authenticator fixes the following issue: CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation bsc1266651. Changes for aws-iam-authenticator: Update golang.org/x/net to v0.57.0. Pat...