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Now that we have moved to net 8 from net 6, and with us no longer supporting the mono runtime, we can raise the C# version to match that supported by the net 8 runtime. This unlocks C# 10, C# 11 and C# 12 features previously unavailable to us. - https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history#c-version-10 - https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history#c-version-11 - https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history#c-version-12 A newer version of StyleCop is required to avoid rules tripping up on the new syntax. Enable a handful of style rules that don't have many violations.