Incrementing VERSION to 118.0.5993.115

Change-Id: I16b609aef0ff65ab207e81cd9ca08666805b2097
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4966962
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5993@{#1396}
Cr-Branched-From: 5113507-refs/heads/main@{#1192594}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=118
 MINOR=0
 BUILD=5993
-PATCH=114
+PATCH=115