docs: update security.md

https://eclipse-tractusx.github.io/docs/release/trg-7/trg-7-01/#security-file

SECURITY.md

@@ -2,5 +2,18 @@
 
 ## Reporting a Vulnerability
 
-Please report a found vulnerability here:
-[https://www.eclipse.org/security/](https://www.eclipse.org/security/)
+Please do **not** report security vulnerabilities through public GitHub issues.
+
+Please report vulnerabilities to this repository via **GitHub security advisories** instead.
+
+How? Inside affected repository --> security tab
+
+for contributor:
+--> Report a vulnerability
+
+for committer:
+--> advisories --> New draft security advisory
+
+In severe cases, you can also report a found vulnerability via mail or eclipse issue here: https://www.eclipse.org/security/
+
+See [Eclipse Foundation Vulnerability Reporting Policy](https://www.eclipse.org/projects/handbook/#vulnerability)