给分析器的 System.Text.Json 降级，因为 msbuild 编不过

Author: walterlv

src/DotNetCampus.ModelContextProtocol.Analyzer/DotNetCampus.ModelContextProtocol.Analyzer.csproj

@@ -20,6 +20,10 @@
     <PackageReference Include="System.Text.Json" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageVersion Update="System.Text.Json" Version="8.0.6" />
+  </ItemGroup>
+
   <ItemGroup>
     <Compile Include="..\DotNetCampus.ModelContextProtocol\Properties\Compatibility.cs" LinkBase="Properties" />
     <Compile Include="..\DotNetCampus.ModelContextProtocol\CompilerServices\*Attribute.cs" LinkBase="CompilerServices" />