Fix typo in cvss_v3 field

Author: jasnow

rubies/mruby/CVE-2022-1286.yml

@@ -9,7 +9,7 @@ description: |
   repository mruby/mruby prior to 3.2. Possible arbitrary code
   execution if being exploited.
 cvss_v2: 7.5
-cvss_v3: 9.18
+cvss_v3: 9.8
 patched_versions:
   - '~> 3.2.0-rc'
   - '>= 3.2.0'