SUSE-SU-2019:3086-1 Security update for libidn2

This update for libidn2 to version 2.2.0 fixes the following issues: - CVE-2019-12290: Fixed an improper round-trip check when converting A-labels to U-labels bsc1154884. - CVE-2019-18224: Fixed a heap-based buffer overflow that was caused by long domain strings bsc1154887...