Use .NET 8 SDK.

SourceLink is now included in the SDK and doesn't need to be explicitly referenced.

Author: bgrainger

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "6.0.415",
-    "rollForward": "latestPatch"
+    "version": "8.0.100",
+    "rollForward": "latestFeature"
   }
 }

src/AdoNet.Specification.Tests/AdoNet.Specification.Tests.csproj

@@ -36,7 +36,6 @@
     <PackageReference Include="xunit" Version="2.6.1" />
     <PackageReference Include="xunit.extensibility.execution" Version="2.6.1" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>