Update CONTRIBUTING.adoc

Author: bnasslahsen

CONTRIBUTING.adoc

@@ -48,7 +48,7 @@ much information as possible:
 == Reporting Security Vulnerabilities
 If you think you have found a security vulnerability in Spring Boot please *DO NOT*
 disclose it publicly until we've had a chance to fix it. Please don't report security
-vulnerabilities using GitHub issues, instead head over to springdoc99@gmail.com and
+vulnerabilities using GitHub issues, instead head over to support@springdoc.org and
 learn how to disclose them responsibly.