Version 3.9.0-333.4.beta

Change-Id: Ica1cda1e6c19b29edc9871957a018c1145998955
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/441961
Commit-Queue: Alexander Thomas <athom@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>

tools/VERSION

diff --git a/tools/VERSION b/tools/VERSION
index 6fe993b..3b284c0 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 9
 PATCH 0
 PRERELEASE 333
-PRERELEASE_PATCH 3
+PRERELEASE_PATCH 4