Update package references for SourceLink and System.Text.Json

Removed Microsoft.SourceLink.GitHub package reference.
Updated System.Text.Json package reference:
- For net6.0 and netstandard2.0: version range [6.0.11, 7.0.0).
- For net8.0: version range [8.0.5, 9.0.0).

src/Dax.Formatter/Dax.Formatter.csproj

@@ -43,11 +43,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
-    <PackageReference Include="System.Text.Json" Version="6.0.3" />
+    <PackageReference Include="System.Text.Json" Version="[6.0.11, 7.0.0)" Condition="'$(TargetFramework)' == 'net6.0' or '$(TargetFramework)' == 'netstandard2.0'" />
+    <PackageReference Include="System.Text.Json" Version="[8.0.5, 9.0.0)" Condition="'$(TargetFramework)' == 'net8.0'" />
   </ItemGroup>
 
   <PropertyGroup>