svn commit: r63425 - /release/flink/flink-1.15.4/

[mapohl]

Author: mapohl
Date: Fri Aug 11 10:17:36 2023
New Revision: 63425

Log:
[FLINK-31570][release] Remove Flink 1.15.4 sources

Removed:
    release/flink/flink-1.15.4/