Update grimes to 15ecf9414859b16a8a19ac6748a622a5498d57e3

This fixes an issue when wait4 returns a 0 return status causing the
reaping loop to continue to run.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

hack/dockerfile/install-binaries.sh

@@ -5,7 +5,7 @@ set -x
 TOMLV_COMMIT=9baf8a8a9f2ed20a8e54160840c492f937eeaf9a
 RUNC_COMMIT=02f8fa7863dd3f82909a73e2061897828460d52f
 CONTAINERD_COMMIT=837e8c5e1cad013ed57f5c2090c8591c10cbbdae
-GRIMES_COMMIT=f207601a8d19a534cc90d9e26e037e9931ccb9db
+GRIMES_COMMIT=15ecf9414859b16a8a19ac6748a622a5498d57e3
 
 export GOPATH="$(mktemp -d)"