Disable all plugin updates:-
function aviweb_disable_plugin_updates( $values ) {

foreach($values as $value) {
unset( $value->response[‘plugin/plugin.php’] );
}
return;
}
add_filter( ‘site_transient_update_plugins’, ‘aviweb_disable_plugin_updates’ );

Disable single plugin update:-
function aviweb_disable_plugin_updates( $value ) {
unset( $value->response[‘plugin_name/plugin_file.php’] );
return $value;
}
add_filter( ‘site_transient_update_plugins’, ‘aviweb_disable_plugin_updates’ );