Remove Ubuntu 18.04 and 16.04 from tests #706

Job	Run time
chef-kitchen-matrix	3s
chef-lint-spec-test	57s
chef-kitchen-windows (windows-2019, default)	19m 18s
chef-kitchen-linux (amazonlinux-2)	1m 31s
chef-kitchen-windows (windows-2019, custom-vars)	18m 8s
chef-kitchen-linux (centos-9)	26m 22s
chef-kitchen-windows (windows-2019, with-default-windows-dotnet-instrumentation)	15m 45s
chef-kitchen-linux (rockylinux-8)	26m 1s
chef-kitchen-windows (windows-2019, with-custom-windows-dotnet-instrumentation)	18m 41s
chef-kitchen-linux (rockylinux-9)	21m 33s
chef-kitchen-windows (windows-2022, default)	23m 48s
chef-kitchen-linux (debian-11)	19m 5s
chef-kitchen-windows (windows-2022, custom-vars)	27m 7s
chef-kitchen-linux (debian-12)	15m 34s
chef-kitchen-windows (windows-2022, with-default-windows-dotnet-instrumentation)	24m 25s
chef-kitchen-linux (opensuse-12)	2m 55s
chef-kitchen-windows (windows-2022, with-custom-windows-dotnet-instrumentation)	28m 41s
chef-kitchen-linux (opensuse-15)	27m 52s
chef-kitchen-linux (oraclelinux-7)	2m 13s
chef-kitchen-linux (oraclelinux-8)	46m 10s
chef-kitchen-linux (ubuntu-2004)	18m 23s
chef-kitchen-linux (ubuntu-2204)	17m 36s
	6h 42m 8s

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