Security update for elemental-operator

This update for elemental-operator fixes the following issues: Updated to version 1.6.8: Deactivated e2e workflow Updated header year CVE-2025-22870: golang.org/x/net/proxy: Fixed proxy bypass using IPv6 zone IDs bsc1238700 CVE-2025-22869: golang.org/x/crypto/ssh: Fixed Denial of Service in the K...