fix: add announcement ref to top-level vuln json

[RafaelGSS]

Follow up #1118

[codecov]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.30%. Comparing base (c3b9dc6) to head (023b213).

Files with missing lines	Patch %	Lines
lib/security_blog.js	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1119      +/-   ##
==========================================
+ Coverage   63.27%   63.30%   +0.03%     
==========================================
  Files          50       50              
  Lines        8342     8337       -5     
==========================================
  Hits         5278     5278              
+ Misses       3064     3059       -5     

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