Revert language version fix and find another fix?

[andyleejordan]

In #1541 we updated the language version from 9.0 to 10.0 to workaround a bug with .NET 6 Preview 7; however, this isn't the greatest workaround because it requires everyone building PSES to update their dotnet:

CSC : error CS1617: Invalid option '10.0' for /langversion. Use '/langversion:?' to list supported values. [/Users/andschwa/src/PowerShellEditorServices/src/PowerShellEditorServices/PowerShellEditorServices.csproj]

We didn't realize this because the CI always comes with an up-to-date dotnet.

The simply solution is for PSES devs to just delete .dotnet and let the build script install the latest, but perhaps we should fix it another way.

[andyleejordan]

Sorry @rjmholt.

[rjmholt]

I'm guessing setting LangVersion to latest isn't going to work for some target frameworks...

[andyleejordan]

Probably not, and I don't particularly want to just randomly adopt their newest language 😢

[rjmholt]

just randomly adopt their newest language

It tends to be tethered to the framework version, but yeah it's probably not the right solution here.

Maybe we want a conditional entry to temporarily work around the issue? Not sure if there's an easy way to test the sdk version