Changes:
* Replace docker with podman since it is still free to use [1625](https://github.com/opencybersecurityalliance/stix-shifter/pull/1625)
* Update group_ref keyword documenation [1622](https://github.com/opencybersecurityalliance/stix-shifter/pull/1622)
* add email-message translation to ecs [1621](https://github.com/opencybersecurityalliance/stix-shifter/pull/1621)
Fixes:
* Add missing group param to connector configs, fix CrowdStrike spelling [1626](https://github.com/opencybersecurityalliance/stix-shifter/pull/1626)
Dependency update:
* Bump colorlog from 6.7.0 to 6.8.0 in /stix_shifter [1624](https://github.com/opencybersecurityalliance/stix-shifter/pull/1624)
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