Updating trunk VERSION from 5590.0 to 5591.0

* This is an automated release commit.
* Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true

Change-Id: I0fd316ca1f90b25d5ddb32bd8756dd6f4ecaa523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4240840
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1104228}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=112
 MINOR=0
-BUILD=5590
+BUILD=5591
 PATCH=0