[Solution] Update preprocessor directives ahead of System.Diagnostics.DiagnosticSource .NET 7 update #3095
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Changes
I needed to target a local .NET 7 build of System.Diagnostics.DiagnosticSource to benchmark some changes I am working on with the runtime team. There were some surprises/headaches getting that up and running! .NET 7 DiagnosticSource drops support for net461 (bumped to net462), net5.0, & netcoreapp3.1. Presumably because they will all be out of support by the time .NET 7 releases. We will need to update the targets in most (all?) of our csproj files in order to consume .NET 7. I'm not going to check that in because it will disrupt the 1.2 metrics effort, but I'm checking in the updates I made to preprocessor directives. Should be safe to do now and save a little bit of effort when it comes time to do that upgrade.