Version 2.9.0

Merge commit 'e2ea2e82e8785e18df30b7a06ef7cbc73fd9a81a' into stable

tools/VERSION

diff --git a/tools/VERSION b/tools/VERSION
index 40e02d0..7eadffb 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -29,11 +29,11 @@
 #  * Deprecating an old ABI version:
 #     - increase OLDEST_SUPPORTED_ABI_VERSION to the version that is supported.
 #
-CHANNEL beta
+CHANNEL stable
 MAJOR 2
 MINOR 9
 PATCH 0
-PRERELEASE 21
-PRERELEASE_PATCH 10
+PRERELEASE 0
+PRERELEASE_PATCH 0
 ABI_VERSION 38
 OLDEST_SUPPORTED_ABI_VERSION 38