Incrementing VERSION to 91.0.4432.2

TBR=benmason@chromium.org

Change-Id: Ie81049d455acb5dcd4f6fd025dbe2329be59559d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2726369
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4432@{#3}
Cr-Branched-From: 7cb90f8-refs/heads/master@{#858399}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=91
 MINOR=0
 BUILD=4432
-PATCH=1
+PATCH=2