Setting version to 115.0.5787.7

Change-Id: I45a7269d15c7e6573d1d9b80c860d0299d791542
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4552656
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5787@{#5}
Cr-Branched-From: fbef34b-refs/heads/main@{#1147131}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=115
 MINOR=0
 BUILD=5787
-PATCH=2
+PATCH=7