Fix some printf format calls as go 1.24 govet fails if the format strings are not constant. (#847)

Author: mmamczur

cmd/auth-provider-gcp/main.go

@@ -39,15 +39,15 @@ func main() {
 	}
 	credCmd, err := app.NewGetCredentialsCommand()
 	if err != nil {
-		klog.Errorf(err.Error())
+		klog.Errorf("%s", err.Error())
 		os.Exit(1)
 	}
 	rootCmd.AddCommand(credCmd)
 	klog.InitFlags(nil)
 	flag.Parse()
 	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
 	if err := rootCmd.Execute(); err != nil {
-		klog.Errorf(err.Error())
+		klog.Errorf("%s", err.Error())
 		os.Exit(1)
 	}
 }

pkg/clientauthplugin/gcp/gcp_test.go

@@ -113,7 +113,7 @@ func TestHelperProcess(t *testing.T) {
 		fmt.Fprintf(os.Stdout, "call cmd=%q got args %v, want: %v\n", gotCmd, gotArgs, output.args)
 		os.Exit(1)
 	}
-	fmt.Fprintf(os.Stdout, output.output)
+	fmt.Fprintf(os.Stdout, "%s", output.output)
 	os.Exit(0)
 }