chore: execute goimports to format the code (#7983)

* chore: execute goimports to format the code

Signed-off-by: promalert <promalert@outlook.com>

* goimports -w .

---------

Signed-off-by: promalert <promalert@outlook.com>
Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/operation/assign_file_id_test.go

@@ -3,10 +3,11 @@ package operation
 import (
 	"context"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/pb"
-	"google.golang.org/grpc"
 	"testing"
 	"time"
+
+	"github.com/seaweedfs/seaweedfs/weed/pb"
+	"google.golang.org/grpc"
 )
 
 func BenchmarkWithConcurrency(b *testing.B) {