chore: bump shellhub version to v0.19.0 #305

Job	Run time
Build and publish 'cli' to Docker Registry	1m 0s
Build and publish 'ssh' to Docker Registry	1m 5s
Build and publish 'gateway' to Docker Registry	57s
Build and publish 'ui' to Docker Registry	2m 17s
Build and publish 'api' to Docker Registry	1m 11s
	6m 30s

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