chore(tests): reorder import statements for clarity

Author: mrz1836

subtree_benchmark_test.go

@@ -6,9 +6,10 @@ import (
 	"testing"
 
 	"github.com/bsv-blockchain/go-bt/v2/chainhash"
-	"github.com/bsv-blockchain/go-subtree"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/bsv-blockchain/go-subtree"
 )
 
 func BenchmarkSubtreeAddNode(b *testing.B) {