Updating trunk VERSION from 4296.0 to 4297.0

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

Change-Id: Ia88453db2f59e773c738b0a5a18730d4f68b2a0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482883Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#818276}

chrome/VERSION

 MAJOR=88
 MINOR=0
-BUILD=4296
+BUILD=4297
 PATCH=0