docs: update SECURITY.md with new GHSA reporting feature (#36367)

SECURITY.md

@@ -2,7 +2,7 @@
 
 The Electron team and community take security bugs in Electron seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
 
-To report a security issue, email [security@electronjs.org](mailto:security@electronjs.org) and include the word "SECURITY" in the subject line.
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/electron/electron/security/advisories/new) tab.
 
 The Electron team will send a response indicating the next steps in handling your report. After the initial reply to your report, the security team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.