[release-branch.go1.15] go1.15.15

Change-Id: I42891b98d822d57aaead8815d2a32ea625e8437b
Reviewed-on: https://go-review.googlesource.com/c/go/+/339450
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Trust: Damien Neil <dneil@google.com>
diff --git a/VERSION b/VERSION
index cda321d..b035c3c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.15.14
\ No newline at end of file
+go1.15.15
\ No newline at end of file