Incrementing VERSION to 120.0.6099.8

Change-Id: I96a1e5833f8e0df6454756dc1d95e02a1bd0e03b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4996250
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/6099@{#59}
Cr-Branched-From: e6ee450-refs/heads/main@{#1217362}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=120
 MINOR=0
 BUILD=6099
-PATCH=7
+PATCH=8