Updating trunk VERSION from 4216.0 to 4217.0

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

Change-Id: Id45c7f9695045347d9675656c83f0aadeb4013a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324177Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#792510}

chrome/VERSION

 MAJOR=86
 MINOR=0
-BUILD=4216
+BUILD=4217
 PATCH=0