Update CVE-2025-7207.yml with related URLs

Added related URLs for CVE-2025-7207 in the YAML file.

Author: jasnow

rubies/mruby/CVE-2025-7207.yml

@@ -20,7 +20,8 @@ cvss_v4: 4.4
 notes: |
   - Not patched - mruby 3.5.0 has not been released as of 2026/02/07.
   - Found Issue #6509 listed in **unreleased** mruby 3.5 file listed below.
-url:
+related:
+  url:
     - https://nvd.nist.gov/vuln/detail/CVE-2025-7207
     - https://github.com/mruby/mruby/blob/6f321251785c2396cb7e6a576ac2080c1adb4491/NEWS.md
     - https://github.com/mruby/mruby/commit/1fdd96104180cc0fb5d3cb086b05ab6458911bb9.patch