cagent 1.9.16

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## What's Changed
* Fix #848 by @dgageot in https://github.com/docker/cagent/pull/857
* Remove the mouse filter by @rumpl in https://github.com/docker/cagent/pull/859
* Show multi-line error messages by @dgageot in https://github.com/docker/cagent/pull/860
* RAG support  by @krissetto in https://github.com/docker/cagent/pull/843
* Fix api endpoint handling when using oci references by @krissetto in https://github.com/docker/cagent/pull/861
Full Changelog: docker/cagent@v1.9.15...v1.9.16

View the full release notes at https://github.com/docker/cagent/releases/tag/v1.9.16.

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