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<div class="accordion-body">
    <?php
    $args = [
        'post_type' => 'post',
    ];
    $sidebar_posts = new WP_Query($args);
    $all_cats = get_terms( [
         'taxonomy' => 'category'
    ]) ;

    ?>
    <ul>
    <?php
    foreach ( $all_cats as $cat ) :
        $category_link = get_category_link( $cat->term_id );  ?>
        <li><a href="<?php echo $category_link ; ?>"><?php echo $cat->name;  ?></a></li>
    <?php endforeach ; ?>
    </ul>

</div>