Updating trunk VERSION from 4772.0 to 4773.0

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

Change-Id: I567f8760cefcfe53fac4d71adb2bd5f5fbc837b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3347801
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#952658}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=99
 MINOR=0
-BUILD=4772
+BUILD=4773
 PATCH=0