docs: update security contact email

Author: jornfranke

SECURITY.md

@@ -2,5 +2,5 @@
 Security of our solutions is important. Any peer review is very welcome so that organisations using this web application are never compromised.
 
 ### Report security issues
- You can report any security issues to zuinnote@gmail.com. Security issues have depending on their severity over bug fixes and/or work on new features. Please give the application developers and the organisations using the applications some time to respond and we kindly ask you to treat all security issues privately to allow for this.
+ You can report any security issues to security-oss@zuinnote.eu. Security issues have depending on their severity over bug fixes and/or work on new features. Please give the application developers and the organisations using the applications some time to respond and we kindly ask you to treat all security issues privately to allow for this.