Use .NET 9

Author: Tyrrrz

.github/workflows/main.yml

@@ -30,7 +30,7 @@ jobs:
       package-version: ${{ inputs.package-version || (github.ref_type == 'tag' && github.ref_name) || format('0.0.0-ci-{0}', github.sha) }}
       dotnet-version: |
         3.1.x
-        8.0.x
+        9.0.x
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       NUGET_TOKEN: ${{ secrets.NUGET_TOKEN }}

PolyShim.Tests/PolyShim.Tests.csproj

@@ -5,7 +5,7 @@
   <Import Project="../PolyShim/PolyShim.targets" />
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp3.1;net8.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net9.0</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOsPlatform('Windows'))">$(TargetFrameworks);net462</TargetFrameworks>
   </PropertyGroup>