Update golang to 1.22.

(Defer konnectivity-client to separate PR).

.github/workflows/e2e.yaml

@@ -12,7 +12,6 @@ on:
 
 env:
   GO_TOOLCHAIN: "golang"
-  GO_VERSION: "1.21.6"
   # TODO: match BASEIMAGE with Makefile default (nonroot variant)
   BASEIMAGE: "gcr.io/distroless/static-debian11"
   KIND_CLUSTER_NAME: "kind"
@@ -25,7 +24,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: ${{ env.GO_VERSION }}
+        go-version-file: go.mod
       id: go
 
     - name: Check out code

Makefile

@@ -24,7 +24,7 @@ ALL_ARCH ?= amd64 arm arm64 ppc64le s390x
 # The output type could either be docker (local), or registry.
 OUTPUT_TYPE ?= docker
 GO_TOOLCHAIN ?= golang
-GO_VERSION ?= 1.21.9
+GO_VERSION ?= 1.22.2
 BASEIMAGE ?= gcr.io/distroless/static-debian11:nonroot
 
 ifeq ($(GOPATH),)

go.mod

@@ -1,6 +1,6 @@
 module sigs.k8s.io/apiserver-network-proxy
 
-go 1.21
+go 1.22
 
 require (
 	github.com/google/uuid v1.6.0