Updated advisory posts against rubysec/ruby-advisory-db@ac6a3c1

Author: jasnow

advisories/_posts/2024-03-21-CVE-2024-27280.md

@@ -30,6 +30,7 @@ advisory:
 
     You can use `gem update stringio` to update it. If you are using bundler,
     please add `gem "stringio", ">= 3.0.1.2"` to your `Gemfile`.
+  cvss_v3: 9.8
   patched_versions:
   - ">= 3.0.1.1"
 ---