CLSA-2026-1776952176 ruby: Fix of 4 CVEs

CVE-2024-39908: fix ReDoS in REXML parser for repeated / character reference payloads - CVE-2024-41123: fix ReDoS in REXML source.match when no terminator string is specified - CVE-2024-41946: add XML entity expansion limit to REXML SAX and pull parsers - CVE-2024-43398: fix DoS via deep elements...