Version 1.21.0-dev.6.0

Merge 6689fb80cd376ee63d526a132d4ae35da344182e into dev
diff --git a/tools/VERSION b/tools/VERSION
index ff9f90a..4b02ee1e 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -24,9 +24,9 @@
 #  * Making cherry-picks to stable channel
 #     - increase PATCH by 1
 #
-CHANNEL be
+CHANNEL dev
 MAJOR 1
 MINOR 21
 PATCH 0
-PRERELEASE 0
+PRERELEASE 6
 PRERELEASE_PATCH 0