fix(tests): Round 40 - Remove unused require import

Removed unused import from prometheus_deployment_test.go:
- github.com/stretchr/testify/require

Errors fixed in Round 40: 1
Total errors fixed across ALL 40 rounds: 169

Author: thc1006

adapters/vnf-operator/tests/monitoring/prometheus_deployment_test.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
-	"github.com/stretchr/testify/require"
 
 	monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"