Mattermost (and operator) - Add Affinity

Bump tag for Mattermost & operator to add affinity pass throughs:

https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost-operator/-/merge_requests/10

https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost/-/merge_requests/19