Incrementing VERSION to 110.0.5481.81

Change-Id: I23f82b4a13ab12461a023c0bdf9fac4fb40f1054
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4211508
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5481@{#850}
Cr-Branched-From: 130f3e4-refs/heads/main@{#1084008}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=110
 MINOR=0
 BUILD=5481
-PATCH=80
+PATCH=81