Automatic update of RELEASED_VERSIONS file for Rox release 4.7.3 (#2123)

Author: rhacs-bot

RELEASED_VERSIONS

@@ -35,3 +35,4 @@
 3.19.7 4.5.9  # Rox release 4.5.9 by rhacs-bot at Mon Apr 14 17:21:02 UTC 2025
 3.21.1 4.7.2  # Rox release 4.7.2 by rhacs-bot at Tue Apr 15 21:06:40 UTC 2025
 3.20.7 4.6.5  # Rox release 4.6.5 by rhacs-bot at Wed Apr 16 18:54:41 UTC 2025
+3.21.1 4.7.3  # Rox release 4.7.3 by rhacs-bot at Tue May 13 15:32:16 UTC 2025