Centralize <LangVersion> for netstandard2.0 projects.
#1322
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The default
<LangVersion>fornetstandard2.0projects is7.3, which does not contain many of the niceties we would like to use. Throughout our history we have updated individual projects to use the latest language features, but this has led to inconsistencies.Instead, standardize this in
Directory.Build.targetsto use a common C# language version fornetstandard2.0projects.Note we standardized on
13.0(the one that ships with .NET 9) instead oflatest, aslatestis discouraged because it can change based on what versions are installed on a machine.