Update the patch version update steps for I18n

What does this MR do?

As suggested by @reprazent in #220434 (comment 358327984), sudo -u git -H bundle exec rake gettext:compile RAILS_ENV=production should be used instead of sudo -u git -H bundle exec rake gettext:pack RAILS_ENV=production when updating GitLab's patch versions.

Related issues

#220434 (comment 358327984)

Author's checklist (required)

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• If you have developer access or higher (for example, GitLab team members or Core Team members)
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When applicable:

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Review checklist

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