chore: Update System.Text.Json in test projects per CVE-2024-30105

Author: ashovlin

Libraries/test/Amazon.Lambda.Annotations.SourceGenerators.Tests/Amazon.Lambda.Annotations.SourceGenerators.Tests.csproj

@@ -16,7 +16,7 @@
         <PackageReference Include="Moq" Version="4.18.4" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
         <PackageReference Include="System.Memory" Version="4.5.5" />
-        <PackageReference Include="System.Text.Json" Version="8.0.3" />
+        <PackageReference Include="System.Text.Json" Version="8.0.4" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

Libraries/test/TestServerlessApp/TestServerlessApp.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.3" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Amazon.Lambda.Annotations.SourceGenerator\Amazon.Lambda.Annotations.SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />