go.mod: go 1.22

Depended by k8s.io/cri-api >= v0.30.0 (Kubernetes v1.30, PR 10019)
https://github.com/kubernetes/cri-api/blob/v0.30.0/go.mod#L5

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

BUILDING.md

@@ -25,7 +25,7 @@ A codespace will open in a web-based version of Visual Studio Code. The [dev con
 
 To build the `containerd` daemon, and the `ctr` simple test client, the following build system dependencies are required:
 
-* Go 1.21.x or above
+* Go 1.22.x or above
 * Protoc 3.x compiler and headers (download at the [Google protobuf releases page](https://github.com/protocolbuffers/protobuf/releases))
 * Btrfs headers and libraries for your distribution. Note that building the btrfs driver can be disabled via the build tag `no_btrfs`, removing this dependency.
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/containerd/containerd/v2
 
-go 1.21
+go 1.22.0
 
 require (
 	dario.cat/mergo v1.0.0