build(deps): 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

@@ -94,7 +94,7 @@ require (
 	github.com/chai2010/gettext-go v1.0.2 // indirect
 	github.com/cloudflare/circl v1.2.0 // indirect
 	github.com/containerd/console v1.0.3 // indirect
-	github.com/containerd/containerd v1.6.15 // indirect
+	github.com/containerd/containerd v1.6.18 // indirect
 	github.com/containernetworking/cni v1.1.2 // indirect
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect

go.sum

@@ -208,8 +208,8 @@ github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWH
 github.com/containerd/cgroups v1.0.4 h1:jN/mbWBEaz+T1pi5OFtnkQ+8qnmEbAr1Oo1FRm5B0dA=
 github.com/containerd/console v1.0.3 h1:lIr7SlA5PxZyMV30bDW0MGbiOPXwc63yRuCP0ARubLw=
 github.com/containerd/console v1.0.3/go.mod h1:7LqA/THxQ86k76b8c/EMSiaJ3h1eZkMkXar0TQ1gf3U=
-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/containernetworking/cni v1.1.2 h1:wtRGZVv7olUHMOqouPpn3cXJWpJgM6+EUl31EQbXALQ=
 github.com/containernetworking/cni v1.1.2/go.mod h1:sDpYKmGVENF3s6uvMvGgldDWeG8dMxakj/u+i9ht9vw=
 github.com/containernetworking/plugins v1.2.0 h1:SWgg3dQG1yzUo4d9iD8cwSVh1VqI+bP7mkPDoSfP9VU=