Bump System.Text.Json version due to CVE-2024-30105 (#5744)

Author: rajkumar-rangaraj

examples/Directory.Packages.props

@@ -1,6 +1,6 @@
 <Project>
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Packages.props, $(MSBuildThisFileDirectory)..))" />
   <ItemGroup>
-    <PackageVersion Update="System.Text.Json" Version="6.0.5" />
+    <PackageVersion Update="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 </Project>

test/Directory.Packages.props

@@ -1,7 +1,7 @@
 <Project>
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Packages.props, $(MSBuildThisFileDirectory)..))" />
   <ItemGroup>
-    <PackageVersion Update="System.Text.Json" Version="7.0.1" />
+    <PackageVersion Update="System.Text.Json" Version="8.0.4" />
     <PackageVersion Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
     <PackageVersion Include="Microsoft.Coyote" Version="1.7.10" />
   </ItemGroup>