style: format code with Go fmt and Gofumpt

This commit fixes the style issues introduced in d8cf84a according to the output
from Go fmt and Gofumpt.

Details: None

gin/jose_test.go

@@ -256,7 +256,7 @@ func TestCustomHeaderName(t *testing.T) {
 	if body := w.Body.String(); body != "" {
 		t.Errorf("unexpected body: %s", body)
 	}
-} 
+}
 
 func TestTokenSigner_error(t *testing.T) {
 	ts := TokenSigner(

mux/jose_test.go

@@ -9,10 +9,10 @@ import (
 	"strings"
 	"testing"
 
+	jose "github.com/krakendio/krakend-jose/v2"
 	"github.com/luraproject/lura/v2/logging"
 	"github.com/luraproject/lura/v2/proxy"
 	muxlura "github.com/luraproject/lura/v2/router/mux"
-	jose "github.com/krakendio/krakend-jose/v2"
 )
 
 func TestTokenSignatureValidator(t *testing.T) {