Updating trunk VERSION from 4087.0 to 4088.0

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

Change-Id: I9988634f003ace728c7380837c6fdd858c7622a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106657Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#750842}

chrome/VERSION

 MAJOR=83
 MINOR=0
-BUILD=4087
+BUILD=4088
 PATCH=0