Update CHANGELOG.md

Author: alesnovak-s1

CHANGELOG.md

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 Scalyr Agent 2 Changes By Release
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-## 2.2.4 "TBD" - Jun 22, 2023
+## 2.2.4 "Trillian" - Jun 22, 2023
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-Packaged by Arthur Kamalov <arthurk@sentinelone.com> on Jun 22, 2023 00:00 -0800
+Packaged by Ales Novak <ales.novak@sentinelone.com> on Jul 14, 2023 00:00 -0800
 --->
 Container images:
 * Kubernetes and Docker images switched from Debian to Ubuntu. Python version used in those images now matches Python in this distribution.
+* Vulnerability fixed - pycrypto, certifi
 
 ## 2.2.3 "Elloria" - Jun 22, 2023
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