Renovate: Update module github.com/containerd/containerd to v2

Author: renovate[bot]

go.mod

@@ -3,7 +3,7 @@ module github.com/sapcc/kubernetes-oomkill-exporter
 go 1.24
 
 require (
-	github.com/containerd/containerd v1.7.27
+	github.com/containerd/containerd/v2 v2.1.2
 	github.com/euank/go-kmsg-parser/v2 v2.1.0
 	github.com/golang/glog v1.2.5
 	github.com/prometheus/client_golang v1.22.0