Version 2.19.0-255.1.beta

Merge 2.19.0-255.1.beta into beta
diff --git a/tools/VERSION b/tools/VERSION
index cd76021..9047c02 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -23,9 +23,9 @@
 #  * Making cherry-picks to stable channel
 #     - increase PATCH by 1
 #
-CHANNEL dev
+CHANNEL beta
 MAJOR 2
 MINOR 19
 PATCH 0
 PRERELEASE 255
-PRERELEASE_PATCH 0
+PRERELEASE_PATCH 1