Bump System.Text.Json and System.Threading.Tasks.Extensions

Bumps [System.Text.Json](https://github.com/dotnet/runtime) and System.Threading.Tasks.Extensions. These dependencies needed to be updated together.

Updates `System.Text.Json` from 8.0.5 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v9.0.0)

Updates `System.Threading.Tasks.Extensions` from 4.5.4 to 4.5.4

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Threading.Tasks.Extensions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

src/GraphQL.Server.SourceGenerators/GraphQL.Server.SourceGenerators.csproj

@@ -27,7 +27,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" PrivateAssets="all" />
         <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" PrivateAssets="all" />
-        <PackageReference Include="System.Text.Json" Version="8.0.5" PrivateAssets="all" GeneratePathProperty="true" />
+        <PackageReference Include="System.Text.Json" Version="9.0.0" PrivateAssets="all" GeneratePathProperty="true" />
         <PackageReference Include="Scriban" Version="5.10.0" IncludeAssets="Build" />
         <PackageReference Include="Microsoft.CSharp" Version="4.7.0" PrivateAssets="all" />
         <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" PrivateAssets="all" />

src/GraphQL/GraphQL.csproj

@@ -13,6 +13,6 @@
 	<ItemGroup>
 		<PackageReference Include="Microsoft.Extensions.Features" Version="8.0.10" />
 		<PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.1" />
-		<PackageReference Include="System.Text.Json" Version="8.0.5" />
+		<PackageReference Include="System.Text.Json" Version="9.0.0" />
 	</ItemGroup>
 </Project>

tests/GraphQL.Tests/GraphQL.Tests.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>