Bump System.Text.Json to 6.0.11 in Shared.csproj

Author: andystaples

src/Shared/Shared.csproj

@@ -17,6 +17,9 @@
     <PackageReference Include="Microsoft.Azure.DurableTask.Core" />
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" />
     <PackageReference Include="Microsoft.Extensions.Hosting" />
+    <!-- For some reason, this project resolves this at 6.0.0 instead of the centrally defined 8.0.6. 
+         Since 6.0.0 has known vulnerabilities, we override to 6.0.11 to avoid major version changes here. -->
+    <PackageReference Include="System.Text.Json" VersionOverride="6.0.11"/>
   </ItemGroup>
 
 </Project>