Release Notes for v21.4.3

Other Changes

• Security: backported fix for 1414224. #37484
• Security: backported fix for CVE-2023-0928. #37482
• Security: backported fix for CVE-2023-0929. #37480
• Security: backported fix for CVE-2023-0931. #37478
• Security: backported fix for CVE-2023-0932. #37486