Incrementing VERSION to 83.0.4091.7

TBR=benmason@chromium.org

Change-Id: Id65571adca1be45538919d4959e6bf0f095219c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132692
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4091@{#8}
Cr-Branched-From: 7bf845a-refs/heads/master@{#752214}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=83
 MINOR=0
 BUILD=4091
-PATCH=6
+PATCH=7