How to update the records with a button in LWC

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Apex Class

==========

public  class AccountController 

{

   @AuraEnabled(cacheable=true)

   public static List<Account> displayAccounts(){

       return [select Id,Name,Site from Account];

   }

   @AuraEnabled

   public static List<Account> updateRecord(String accId){

       System.debug('@@@@AccountId@@@'+accId);

       Account acc=[select Id,Name,Site from Account where Id=:accId];

       acc.site='Approved';

       try{

           update acc;

       }

   catch (Exception e) {

           System.debug('unable to update the record due to'+e.getMessage());

       }

       return displayAccounts();

   }

}

updateAccount.html

==================

<template>

<table class="slds-table slds-table_cell-buffer slds-table_bordered">

<tr>

<td><b>Name</b></td>

<td><b>Site</b></td>

<td><b>Action</b></td>

</tr>

<template for:each={accounts.data} for:item="acc">

<tr key={acc.Id}>

<td>

{acc.Name}

</td>

<td>

{acc.Site}

</td>

<td>

<lightning-button label="update"  variant="brand" value={acc.Id} onclick={handleUpdate}>

</lightning-button>

</td>

</tr>

</template>

</table>

</template>

</template>

updateAccount.js

================

import { LightningElement,api,wire } from 'lwc';

import displayAccounts from '@salesforce/apex/AccountController.displayAccounts';

import updateRecord from '@salesforce/apex/AccountController.updateRecord';

import { refreshApex } from '@salesforce/apex';

export default class UpdateAccount extends LightningElement {

@api currentRecordId;

@api errorMessage;

    @wire(displayAccounts) accounts;

    handleUpdate(event){

        this.currentRecordId=event.target.value;

        console.log('@@currentRecordId@@@'+this.currentRecordId);

        updateRecord({

            accId:this.currentRecordId

        })

        .then(() => {

            console.log('SUCCESS');

            return refreshApex(this.accounts);

        })

        .catch((error) => {

            this.errorMessage=error;

console.log('unable to update the record due to'+JSON.stringify(this.errorMessage));

        });

    }

}

LightningApplication

=====================

<aura:application extends="force:slds">

<c:updateAccount/>

</aura:application>