Bump github.com/containerd/containerd from 1.6.15 to 1.6.18

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.6.15 to 1.6.18.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](containerd/containerd@v1.6.15...v1.6.18)

---
updated-dependencies:
- dependency-name: github.com/containerd/containerd
  dependency-type: indirect
...

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

go.mod

@@ -33,7 +33,7 @@ require (
 	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/containerd/cgroups v1.0.4 // indirect
-	github.com/containerd/containerd v1.6.15 // indirect
+	github.com/containerd/containerd v1.6.18 // indirect
 	github.com/containerd/continuity v0.3.0 // indirect
 	github.com/containerd/ttrpc v1.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect

go.sum

@@ -196,8 +196,8 @@ github.com/containerd/containerd v1.5.0-beta.4/go.mod h1:GmdgZd2zA2GYIBZ0w09Zvgq
 github.com/containerd/containerd v1.5.0-rc.0/go.mod h1:V/IXoMqNGgBlabz3tHD2TWDoTJseu1FGOKuoA4nNb2s=
 github.com/containerd/containerd v1.5.1/go.mod h1:0DOxVqwDy2iZvrZp2JUx/E+hS0UNTVn7dJnIOwtYR4g=
 github.com/containerd/containerd v1.5.7/go.mod h1:gyvv6+ugqY25TiXxcZC3L5yOeYgEw0QMhscqVp1AR9c=
-github.com/containerd/containerd v1.6.15 h1:4wWexxzLNHNE46aIETc6ge4TofO550v+BlLoANrbses=
-github.com/containerd/containerd v1.6.15/go.mod h1:U2NnBPIhzJDm59xF7xB2MMHnKtggpZ+phKg8o2TKj2c=
+github.com/containerd/containerd v1.6.18 h1:qZbsLvmyu+Vlty0/Ex5xc0z2YtKpIsb5n45mAMI+2Ns=
+github.com/containerd/containerd v1.6.18/go.mod h1:1RdCUu95+gc2v9t3IL+zIlpClSmew7/0YS8O5eQZrOw=
 github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/containerd/continuity v0.0.0-20190815185530-f2a389ac0a02/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/containerd/continuity v0.0.0-20191127005431-f65d91d395eb/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=