Bump github.com/containerd/containerd from 1.6.15 to 1.6.16

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.6.15 to 1.6.16.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](containerd/containerd@v1.6.15...v1.6.16)

---
updated-dependencies:
- dependency-name: github.com/containerd/containerd
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/Microsoft/go-winio v0.6.0 // indirect
 	github.com/ahmetb/gen-crd-api-reference-docs v0.3.1-0.20220720053627-e327d0730470 // Waiting for https://github.com/ahmetb/gen-crd-api-reference-docs/pull/43/files to merge
 	github.com/cloudevents/sdk-go/v2 v2.13.0
-	github.com/containerd/containerd v1.6.15
+	github.com/containerd/containerd v1.6.16
 	github.com/go-git/go-git/v5 v5.5.2
 	github.com/google/go-cmp v0.5.9
 	github.com/google/go-containerregistry v0.12.1