mattermost update to 11.11.0-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/11.11.0-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!388 (merged)

For Issue

Closes: big-bang/product/packages/mattermost#298 (closed)

Upgrade Notices

FIPS deployments: Before upgrading to 11.11.0, ensure the PostgreSQL password in Mattermost SqlSettings.DataSource is at least 14 ASCII characters. If shorter, rotate it in PostgreSQL and Mattermost first. Standard non-FIPS builds are unaffected. Upstream upgrade notes.

If your SSO provider resolves to a private address, allowlist only its hostname in Mattermost ServiceSettings.AllowedUntrustedInternalConnections; outbound OAuth requests now enforce this restriction. Upstream changelog.