[release-branch.go1.16] go1.16.8

Change-Id: I1926e1506e56fd0484bec71f7b43cee62e41b5b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/348812
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>

VERSION

@@ -1 +1 @@
-go1.16.7
+go1.16.8