Bump System.Text.Encodings.Web and System.Text.Json

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

Updates `System.Text.Encodings.Web` from 8.0.0 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

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)

---
updated-dependencies:
- dependency-name: System.Text.Encodings.Web
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

abstractions/src/OpenSearch.Stack.ArtifactsApi/OpenSearch.Stack.ArtifactsApi.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="SemanticVersioning" Version="2.0.2" />
         <PackageReference Include="System.Net.Http" Version="4.3.4" />
         <PackageReference Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
-        <PackageReference Include="System.Text.Json" Version="8.0.5" />
+        <PackageReference Include="System.Text.Json" Version="9.0.0" />
     </ItemGroup>
 
 </Project>

src/ApiGenerator/ApiGenerator.csproj

@@ -20,8 +20,8 @@
     <PackageReference Include="Spectre.Console" Version="0.49.1" />
     <PackageReference Include="System.CommandLine.DragonFruit" Version="0.3.0-alpha.20371.2" />
     <PackageReference Include="RazorLight" Version="2.3.1" />
-    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Encodings.Web" Version="9.0.0" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Views\**\*.cshtml" />