Remove non-functional link from CVE-2025-7207.yml

Removed a non-functional link from the CVE YAML file.

Author: jasnow

rubies/mruby/CVE-2025-7207.yml

@@ -15,9 +15,6 @@ description: |
   is 1fdd96104180cc0fb5d3cb086b05ab6458911bb9. It is recommended
   to apply a patch to fix this issue.
 
-  - Text (not a link)
-    - https://github.com/user-attachments/files/19619499/mruby_crash.txt
-
   ## RELEASE NOTES
   - Found Issue #6509 listed in **unreleased** mruby 3.5 NEWS.md
     file listed below.