Error when updating modules with Drush
This is a common issue in the Drush queue on drupal.org and the consensus is that its related to your version of PHP that runs in client mode versus the version running on your web server, ex. http://drupal.org/node/1402120 or http://drupal.org/node/436968. Of course, some of these were related to PHP 5 vs PHP 4 issues and you're just one version behind on the client but it may help to alias your php version as explained here:

echo 'export PATH="$HOME/packages/bin:$PATH"' &gt; .bash_profile
mkdir -p packages/bin
ln -s /usr/local/php5/bin/php packages/bin/php


Patrick Kenny is right though that this parse error won't affect your upgrade in the end.