Version 3.1.0-262.3.beta

Change-Id: I2307208ce2b5a57677716230d0172371fa6051ab
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/315860
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Kevin Chisholm <kevinjchisholm@google.com>
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/tools/VERSION b/tools/VERSION
index cb0f6e4..197a7d3 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 1
 PATCH 0
 PRERELEASE 262
-PRERELEASE_PATCH 2
+PRERELEASE_PATCH 3