fix(ci): Update CI matrix

[damacus]

Signed-off-by: Dan Webb [email protected]

[github-actions]

Slowest examples

Top 10 slowest examples (13.07 seconds, 63.71% of total time)

Example	Description	Time in seconds
spec/service_spec.rb:16	elasticsearch_service on Ubuntu 18.04 creates systemd unit with restart policy	2.23939
spec/user_spec.rb:15	test::user on Ubuntu 18.04 creates elasticsearch user deleteme in group foo	1.96487
spec/user_spec.rb:15	test::user on Centos 8 creates elasticsearch user deleteme in group foo	1.22517
spec/service_spec.rb:27	elasticsearch_service on Ubuntu 18.04 enables and starts the elasticsearch service	1.11135
spec/user_spec.rb:15	test::user on Ubuntu 20.04 creates elasticsearch user deleteme in group foo	1.10002
spec/service_spec.rb:27	elasticsearch_service on Centos 8 enables and starts the elasticsearch service	1.08968
spec/user_spec.rb:19	test::user on Centos 8 deletes user deleteme	1.08819
spec/user_spec.rb:19	test::user on Ubuntu 18.04 deletes user deleteme	1.08762
spec/user_spec.rb:19	test::user on Ubuntu 20.04 deletes user deleteme	1.08531
spec/service_spec.rb:16	elasticsearch_service on Centos 8 creates systemd unit with restart policy	1.07947