Bump Azure.AI.OpenAI (#43904)

Bumps the dotnet group in /docs/ai/quickstarts/snippets/prompt-completion/azure-openai with 1 update: [Azure.AI.OpenAI](https://github.com/Azure/azure-sdk-for-net).


Updates `Azure.AI.OpenAI` from 2.1.0-beta.2 to 2.1.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.AI.OpenAI_2.1.0-beta.2...Azure.AI.OpenAI_2.1.0)

---
updated-dependencies:
- dependency-name: Azure.AI.OpenAI
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/ai/quickstarts/snippets/prompt-completion/azure-openai/ExtensionsAzureOpenAI.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Identity" Version="1.13.1" />
-    <PackageReference Include="Azure.AI.OpenAI" Version="2.1.0-beta.2" />
+    <PackageReference Include="Azure.AI.OpenAI" Version="2.1.0" />
     <PackageReference Include="Microsoft.Extensions.AI.OpenAI" Version="9.0.0-preview.9.24556.5" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="9.0.0" />