Incrementing VERSION to 100.0.4896.30

Change-Id: I1ffb40a51dcb42f89d38828034cf02c1dc94ff0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3513934
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4896_28@{#3}
Cr-Branched-From: b2705d7-refs/branch-heads/4896@{#399}
Cr-Branched-From: 1f63ff4-refs/heads/main@{#972766}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=100
 MINOR=0
 BUILD=4896
-PATCH=29
+PATCH=30