chore(deps): update mattermost package dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
mattermost-enterprise-edition (source)	patch	2.6.55 -> 2.6.56
mattermost/mattermost-enterprise-edition	minor	9.9.0 -> 9.9.1
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	patch	9.9.0 -> 9.9.1

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Release Notes

mattermost/mattermost-helm (mattermost-enterprise-edition)

### [`v2.6.56`](https://togithub.com/mattermost/mattermost-helm/releases/tag/mattermost-enterprise-edition-2.6.56) [Compare Source](https://togithub.com/mattermost/mattermost-helm/compare/mattermost-enterprise-edition-2.6.55...mattermost-enterprise-edition-2.6.56) Mattermost Enterprise server with high availitibity.

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[zachariahmiller]

testing locally...