Change Successful password reset message

Looking at the login_header() function, it appears that you can use the login_message filter.

add_filter( 'login_message', 'wpse386695_change_message' );
function wpse386695_change_message( $message ) {
    $message = str_replace(
        'Your password has been reset',
        __( 'The text you want to appear', 'plugin-text-domain' ),
        $message
    );
    return $message;
}

Update

To replace the entire login_message string with your own URL (as requested in the comments), you can do this instead:

add_filter( 'login_message', 'wpse386695_replace_message' );
function wpse386695_replace_message( $message ) {
    $message="<p class="message reset-pass">"
               . __( 'Your password has been reset.' )
               . ' <a href="' . esc_url( 'https://example.com/my-login-url' )
               . '">' . __( 'Log in' ) . '</a></p>'

    return $message;
}

…replacing https://example.com/my-login-url with the URL you need, of course.