go.mod: bump golang to 1.22

The build images are having their golang bumped to 1.22 because of the
kube rebase to 1.30. Let's follow suit.

Author: r4f4

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-9-release-golang-1.21-openshift-4.17
+  tag: rhel-9-release-golang-1.22-openshift-4.17

.golangci.yaml

@@ -10,7 +10,7 @@ run:
   - ^scripts
   - ^terraform
   - ^upi
-  go: '1.21'
+  go: '1.22'
   modules-download-mode: vendor
   allow-parallel-runners: true
 output:

go.mod

@@ -1,6 +1,6 @@
 module github.com/openshift/installer
 
-go 1.21
+go 1.22
 
 require (
 	cloud.google.com/go/monitoring v1.18.0