Fix internal field diff in monitoring uptime check (hashicorp#944)

Signed-off-by: Modular Magician <[email protected]>

google-beta/resource_monitoring_uptime_check_config.go

@@ -349,6 +349,11 @@ func resourceMonitoringUptimeCheckConfigRead(d *schema.ResourceData, meta interf
 		return handleNotFoundError(err, d, fmt.Sprintf("MonitoringUptimeCheckConfig %q", d.Id()))
 	}
 
+	res, err = resourceMonitoringUptimeCheckConfigDecoder(d, meta, res)
+	if err != nil {
+		return err
+	}
+
 	project, err := getProject(d, config)
 	if err != nil {
 		return err
@@ -955,3 +960,8 @@ func expandMonitoringUptimeCheckConfigMonitoredResourceLabels(v interface{}, d T
 	}
 	return m, nil
 }
+
+func resourceMonitoringUptimeCheckConfigDecoder(d *schema.ResourceData, meta interface{}, res map[string]interface{}) (map[string]interface{}, error) {
+	d.Set("internal_checkers", nil)
+	return res, nil
+}