Update CVE-2023-51774 with patch version for 1.15.3

See nov/json-jwt#121 and https://github.com/nov/json-jwt/commits/v1.15.3/ for the code

Author: renchap

gems/json-jwt/CVE-2023-51774.yml

@@ -10,6 +10,7 @@ description: |
   bypass of identity checks via a sign/encryption confusion attack.
   For example, JWE can sometimes be used to bypass JSON::JWT.decode.
 patched_versions:
+  - "~> 1.15.3, >= 1.15.3.1"
   - ">= 1.16.6"
 related:
   url: