Incrementing VERSION to 73.0.3683.121

TBR=cmasso@chromium.org

Change-Id: Ib174808a35b9f5d173dff5230e493cac80fc48a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585094
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3683@{#923}
Cr-Branched-From: e51029943e0a38dd794b73caaf6373d5496ae783-refs/heads/master@{#625896}
diff --git a/chrome/VERSION b/chrome/VERSION
index e8616e3..6c9ccbd 100644
--- a/chrome/VERSION
+++ b/chrome/VERSION
@@ -1,4 +1,4 @@
 MAJOR=73
 MINOR=0
 BUILD=3683
-PATCH=120
+PATCH=121