Incrementing VERSION to 91.0.4432.1

TBR=pbommana@chromium.org

Change-Id: Ie49fb8c89e20fc2dddcf3b2ce502eea71d8683de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2726367
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@{#2}
Cr-Branched-From: 7cb90f8-refs/heads/master@{#858399}

chrome/VERSION

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