Upgrade MLS node bindings

[rygine]

Summary

• Upgraded to latest MLS node bindings
• Updated Conversation.send to allow for optional content type
• Added conversation descriptions
• Updated admin tests
• Added conversation description tests

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4ec046b25822c17907141b0a0c881558f8a194b4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @xmtp/mls-client | Patch |

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