Replace usage of http.DefaultClient and http.DefaultTransport (#104135)

Remove usage of http.DefaultClient and http.DefaultTransport

Part of grafana/data-sources#484

pkg/services/auth/gcomsso/gcom_logout_hook.go

@@ -11,6 +11,7 @@ import (
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	"github.com/grafana/grafana/pkg/models/usertoken"
 	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/util/httpclient"
 )
 
 type gcomLogoutRequest struct {
@@ -48,7 +49,7 @@ func (s *GComSSOService) LogoutHook(ctx context.Context, user identity.Requester
 	hReq.Header.Add("Content-Type", "application/json")
 	hReq.Header.Add("Authorization", "Bearer "+s.cfg.GrafanaComSSOAPIToken)
 
-	c := http.DefaultClient
+	c := httpclient.New()
 	resp, err := c.Do(hReq)
 	if err != nil {
 		s.logger.Error("failed to send request", "error", err)