Updating trunk VERSION from 4029.0 to 4030.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=kariah@chromium.org

Change-Id: I6de271cd0349c33500203d3d4d87d2600932bbd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003084Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#732256}

chrome/VERSION

 MAJOR=81
 MINOR=0
-BUILD=4029
+BUILD=4030
 PATCH=0