Update to O# Mono 5.18 in tests

[bjorkstromm]

See OmniSharp/omnisharp-roslyn#1444

[devlead]

@bjorkstromm Is this still relevant since we shifted to using the mono from their release?

bakery/recipe.cake

Lines 39 to 42 in 2619530

	var omnisharpBaseDownloadURL = "https://github.com/OmniSharp/omnisharp-roslyn/releases/download/v1.37.17";
	var omnisharpMonoRuntimeMacOS = $"{omnisharpBaseDownloadURL}/omnisharp-osx.zip";
	var omnisharpMonoRuntimeLinux32= $"{omnisharpBaseDownloadURL}/omnisharp-linux-x86.zip";
	var omnisharpMonoRuntimeLinux64= $"{omnisharpBaseDownloadURL}/omnisharp-linux-x64.zip";

[bjorkstromm]

@bjorkstromm Is this still relevant since we shifted to using the mono from their release?

bakery/recipe.cake

Lines 39 to 42 in 2619530

	var omnisharpBaseDownloadURL = "https://github.com/OmniSharp/omnisharp-roslyn/releases/download/v1.37.17";
	var omnisharpMonoRuntimeMacOS = $"{omnisharpBaseDownloadURL}/omnisharp-osx.zip";
	var omnisharpMonoRuntimeLinux32= $"{omnisharpBaseDownloadURL}/omnisharp-linux-x86.zip";
	var omnisharpMonoRuntimeLinux64= $"{omnisharpBaseDownloadURL}/omnisharp-linux-x64.zip";

Nope, this can be closed.