github: bump golangci-lint image version

It looks like golangci-lint comes with a fixed version of Go, one which is too
old for the code:

level=error msg="Running error: gofmt: analysis skipped: errors in package: [/go/src/k8s.io/klog/test/output.go:846:22: Discard not declared by package io /go/src/k8s.io/klog/test/output.go:864:40: Discard not declared by package io /go/src/k8s.io/klog/test/output.go:876:35: Discard not declared by package io]"

io.Discard was introduced in Go 1.16, using it should be fine and is reflected
in our Go version test matrix (>= 1.17).

Author: pohly

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Lint
         run: |
           docker run --rm -v `pwd`:/go/src/k8s.io/klog -w /go/src/k8s.io/klog \
-            golangci/golangci-lint:v1.23.8 golangci-lint run --disable-all -v \
+            golangci/golangci-lint:v1.50.1 golangci-lint run --disable-all -v \
             -E govet -E misspell -E gofmt -E ineffassign -E golint
   apidiff:
     runs-on: ubuntu-latest