Cannot find where to apply patch for Calendar module issue

Hi,
When I try to use the calendar on my OO site, I get the following error messages:

Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of /home1/fireside/public_html/openout/profiles/openoutreach/modules/contrib/calendar/theme/theme.inc).
Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of /home1/fireside/public_html/openout/profiles/openoutreach/modules/contrib/calendar/theme/theme.inc).

When I search for this error message, it appears to be associated with the Calendar module, and there is a patch available on the issue page.

However, I cannot find the folder for the Calendar module in Open Outreach where I should apply the patch. I understand the basics of how to apply a patch, but it is unclear if this patch is to be applied and where. Is this an issue with Calendar, or something else? Can you please help?

Thanks!