GHSA SYNC: Added cvss_v3 field to 1 advisory

Author: jasnow

gems/rexml/CVE-2024-49761.yml

@@ -27,6 +27,7 @@ description: |
 
   * https://www.ruby-lang.org/en/news/2024/10/28/redos-rexml-cve-2024-49761
     * Announced on www.ruby-lang.org.
+cvss_v3: 7.5
 cvss_v4: 6.6
 patched_versions:
   - ">= 3.3.9"