test: Add grace period for restart monitor test
test: Add grace period for restart monitor test

restart monitor test was failing due to occasionally taking past the
deadline on windows tests. Add a small additional grace period to
deflake the test.

Signed-off-by: David Porter <ba751619d81985aa354511fe26e73fd7ac43a4f5@google.com>

estesp/containerd,estesp/containerd,containerd/containerd,thaJeztah/containerd,dmcgowan/containerd,mikebrow/containerd,thaJeztah/containerd,mikebrow/containerd,containerd/containerd,dmcgowan/containerd