This update for plasma5-workspace fixes the following issues:

- Replace %{_plasma5_bugfix} with hardcoded values in some places to
allow installation with other components being at 5.18.5

- Add patch to fix the weather data for Canada

- Update to 5.18.6
* New bugfix release
* For more details please see:
* https://kde.org/announcements/plasma-5.18.6

- Changes since 5.18.5:

* Fix calendar events not being shown at first
* [applets/systemtray] Fix context menu misplaced (kde#421275)
* [Notifications] Don't take updated time into account for sorting
* [sddm-theme] Prevent the logo from leaking in after a fadeout