svn commit: r78488 - dev/arrow/apache-arrow-21.0.0-rc5

[brycemecum]

Author: brycemecum
Date: Thu Jul 31 19:42:26 2025
New Revision: 78488

Log:
Remove old Apache Arrow RC: apache-arrow-21.0.0-rc5/

Deleted:
   dev/arrow/apache-arrow-21.0.0-rc5/