Update SECURITY.md

Author: norman-ziebal

SECURITY.md

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 We at STACKIT take security seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
 
-To report a security issue, please send an email to [stackit-security@stackit.de](mailto:stackit-security@stackit.de).
+To report a security issue, please send an email to [cybersecurity@stackit.cloud](mailto:cybersecurity@stackit.cloud).
 
 Our 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.