SUSE-SU-2026:20481-1 Security update for expat

This update for expat fixes the following issues: - CVE-2026-24515: failure to copy the encoding handler data passed to XMLSetUnknownEncodingHandler may cause a NULL dereference bsc1257144. - CVE-2026-25210: lack of buffer size check can lead to an integer overflow bsc1257496...