Update server node to 18.19.0-bullseye-slim #17

Job	Run time
create-runner / Create GCE VM	1m 6s
create-runner / Create GCE VM	59s
Configure job parameters	3s
Configure job parameters	3s
Build previewctl	0s
Build previewctl	0s
Build Gitpod	1m 11s
Build Gitpod	2m 12s
infrastructure	0s
infrastructure	0s
Install Monitoring Satellite	0s
Install Monitoring Satellite	0s
Install Gitpod	0s
Install Gitpod	0s
install-app	0s
install-app	0s
Run workspace integration tests on main branch	0s
Run workspace integration tests on main branch	0s
Run integration test	0s
Run integration test	0s
delete-runner / Delete ephemeral GCE VM	35s
delete-runner / Delete ephemeral GCE VM	37s
	6m 46s

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