Fixed versioning error and linting

Author: NirajNandre

go.mod

@@ -2,8 +2,6 @@ module github.com/googleapis/genai-toolbox
 
 go 1.25.7
 
-toolchain go1.26.1
-
 require (
 	cloud.google.com/go/alloydbconn v1.18.0
 	cloud.google.com/go/bigquery v1.74.0

tests/bigtable/bigtable_integration_test.go

@@ -75,8 +75,8 @@ func TestBigtableToolEndpoints(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create AdminClient: %v", err)
 	}
-	
-	t.Cleanup(func() { 
+
+	t.Cleanup(func() {
 		adminClient.Close()
 	})
 
@@ -85,7 +85,6 @@ func TestBigtableToolEndpoints(t *testing.T) {
 		tests.CleanupBigtableTables(t, context.Background(), adminClient, uniqueID)
 	})
 
-
 	ctx, cancel := context.WithTimeout(context.Background(), 7*time.Minute)
 	defer cancel()