chore: add check for attribute name type

Author: joshblack

src/rules/__tests__/no-sx-prop.test.js

@@ -15,7 +15,7 @@ const ruleTester = new RuleTester({
 })
 
 ruleTester.run('no-sx-prop', rule, {
-  valid: [`import {Button} from '@primer/react'`],
+  valid: [],
   invalid: [
     {
       code: `

src/rules/no-sx-prop.js

@@ -71,7 +71,7 @@ module.exports = {
         }
 
         const hasSxProp = node.attributes.some(attr => {
-          if (attr.name.type === 'JSXIdentifier' && attr.name.name === 'sx') {
+          if (attr.name?.type === 'JSXIdentifier' && attr.name.name === 'sx') {
             return true
           }
           return false