mattermostOperator update to 1.25.7-bb.3

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost-operator/-/blob/1.25.7-bb.3/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost-operator!152 (merged)

For Issue

Closes big-bang/product/packages/mattermost-operator#118 (closed)

Upgrade Notices

N/A