Merge pull request kubernetes-sigs#4691 from kersten/chore/enable-whitespace-linter

🌱 (chore): enable 'whitespace' linter in golangci-lint config

Author: k8s-ci-robot

.golangci.yml

@@ -92,4 +92,5 @@ linters:
     - unconvert
     - unparam
     - unused
+    - whitespace