fix: enable usestdlibvars linter (#7770)

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.golangci.yaml

@@ -105,6 +105,7 @@ linters:
     - typecheck
     - unconvert
     - unused
+    - usestdlibvars
 
 run:
   go: '1.22'

integration/registry_test.go

@@ -334,7 +334,7 @@ func requestRegistryToken(imageRef name.Reference, baseDir string, opt registryO
 	}
 
 	// Get a registry token
-	req, err := http.NewRequest("GET", fmt.Sprintf("%s/auth", opt.AuthURL), nil)
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/auth", opt.AuthURL), nil)
 	if err != nil {
 		return "", err
 	}

pkg/dependency/parser/java/pom/parse.go

@@ -703,7 +703,7 @@ func (p *Parser) remoteRepoRequest(repo string, paths []string) (*http.Request,
 	paths = append([]string{repoURL.Path}, paths...)
 	repoURL.Path = path.Join(paths...)
 
-	req, err := http.NewRequest("GET", repoURL.String(), http.NoBody)
+	req, err := http.NewRequest(http.MethodGet, repoURL.String(), http.NoBody)
 	if err != nil {
 		return nil, xerrors.Errorf("unable to create HTTP request: %w", err)
 	}

pkg/iac/adapters/terraform/aws/apigateway/adapt_test.go

@@ -1,6 +1,7 @@
 package apigateway
 
 import (
+	"net/http"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -72,7 +73,7 @@ resource "aws_apigatewayv2_domain_name" "example" {
 								{
 									Methods: []v1.Method{
 										{
-											HTTPMethod:        String("GET"),
+											HTTPMethod:        String(http.MethodGet),
 											AuthorizationType: String("NONE"),
 											APIKeyRequired:    Bool(false),
 										},

pkg/iac/adapters/terraform/aws/apigateway/apiv1_test.go

@@ -1,6 +1,7 @@
 package apigateway
 
 import (
+	"net/http"
 	"testing"
 
 	"github.com/aquasecurity/trivy/internal/testutil"
@@ -35,7 +36,7 @@ resource "aws_api_gateway_method" "example" {
 `,
 			expected: []v1.Method{
 				{
-					HTTPMethod:        String("GET"),
+					HTTPMethod:        String(http.MethodGet),
 					AuthorizationType: String("NONE"),
 					APIKeyRequired:    Bool(false),
 				},
@@ -63,7 +64,7 @@ resource "aws_api_gateway_method" "example" {
 `,
 			expected: []v1.Method{
 				{
-					HTTPMethod:        String("GET"),
+					HTTPMethod:        String(http.MethodGet),
 					AuthorizationType: String("NONE"),
 					APIKeyRequired:    Bool(true),
 				},