style(components): add protected to the render function

packages/core/src/components/select/select-popover.tsx

@@ -50,7 +50,7 @@ export class SelectPopover {
     this.dismiss(value);
   }
 
-  render() {
+  protected render() {
     return (
       <ion-list no-lines={this.mode === 'md'}>
         <ion-radio-group value={this.value}>

packages/core/src/components/select/select.tsx

@@ -369,7 +369,7 @@ export class Select {
     };
   }
 
-  render() {
+  protected render() {
     let addPlaceholderClass = false;
 
     // If selected text has been passed in, use that first