Remove dep and bump golangci-lint in CI

Author: rajathagasthya

.travis.yml

@@ -13,8 +13,7 @@ git:
 go_import_path: sigs.k8s.io/controller-tools
 
 install:
-- go get -u github.com/golang/dep/cmd/dep
-- curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.1
+- curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.23.6
 
 script:
 - GO111MODULE=on TRACE=1 ./test.sh