Update @typespec/http-client-csharp to 1.0.0-alpha.20251003.1 (#741)

- Updated @typespec/http-client-csharp from 1.0.0-alpha.20251002.1 to 1.0.0-alpha.20251003.1
- Updated Microsoft.TypeSpec.Generator.ClientModel from 1.0.0-alpha.20251002.1 to 1.0.0-alpha.20251003.1
- Regenerated OpenAI SDK code with new generator version
- Updated centrally managed package-lock.json file with new dependency versions

Co-authored-by: GitHub Action <[email protected]>

Author: github-actions[bot]

codegen/generator/src/OpenAI.Library.Plugin.csproj

@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Microsoft.TypeSpec.Generator.ClientModel" Version="1.0.0-alpha.20251002.1" />
+      <PackageReference Include="Microsoft.TypeSpec.Generator.ClientModel" Version="1.0.0-alpha.20251003.1" />
     </ItemGroup>
 
   <!-- Copy output to package dist path for local execution and  -->

codegen/package.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "@open-ai/plugin": "file:",
     "@azure-tools/typespec-client-generator-core": "0.60.0",
-    "@typespec/http-client-csharp": "1.0.0-alpha.20251002.1",
+    "@typespec/http-client-csharp": "1.0.0-alpha.20251003.1",
     "@typespec/http": "1.4.0",
     "@typespec/openapi": "1.4.0"
   },