style: format code with Gofumpt and Prettier

This commit fixes the style issues introduced in 05a45e8 according to the output
from Gofumpt and Prettier.

Details: #2595

hack/actions/gen/main.go

@@ -463,7 +463,7 @@ func (data *Data) initData() *Data {
 	} else {
 		data.Maintainer = defaultMaintainer
 	}
- 	return data
+	return data
 }
 
 func (data *Data) generateWorkflowStruct() (*Workflow, error) {