Version 1.21.0-dev.1.0

Merge 941b0c8c392030b0e9b7ddf3b9dff69c7b3eaa51 into dev
diff --git a/tools/VERSION b/tools/VERSION
index ff9f90a..ba2e5eb 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 1
 PRERELEASE_PATCH 0