Updating trunk VERSION from 4247.0 to 4248.0

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

Change-Id: I8de391c577d2371a8ffdbc97344f2ff04f29f1d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2381057Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#802498}

chrome/VERSION

 MAJOR=87
 MINOR=0
-BUILD=4247
+BUILD=4248
 PATCH=0