Update file CVE-2025-9958.json to correct CVSS score

ADandyrequested to merge
adgl2025-master-patch-2fb4 into master

The CVSS score when this was published was incorrect. Changing it per discussion in Bug Bounty Council: https://gitlab.com/gitlab-com/gl-security/security-department-meta/-/issues/2001#note_2727638832

Merge request reports