Incrementing VERSION to 103.0.5060.31

Change-Id: I77aee86559342c3a5c83a9d9e7b0f9deea0fc1ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3677732
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5060@{#391}
Cr-Branched-From: b83393d-refs/heads/main@{#1002911}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=103
 MINOR=0
 BUILD=5060
-PATCH=30
+PATCH=31