Update Azure OpenAI API version to 2024-05-01-preview

Updated the Azure OpenAI Service API version from `2024-04-01-preview` to `2024-05-01-preview` in both the `UseAzure.md` documentation and the `AzureChatGptServiceConfiguration.cs` source file. This change affects the `UseAzure` method and the `ApiVersion` property in the `AzureChatGptServiceConfiguration` class, ensuring the service uses the latest API version.

Author: marcominerva

docs/ChatGptNet/ChatGptOptionsBuilderExtensions/UseAzure.md

@@ -4,7 +4,7 @@ Configures Azure OpenAI Service settings.
 
 ```csharp
 public static ChatGptOptionsBuilder UseAzure(this ChatGptOptionsBuilder builder, 
-    string resourceName, string apiKey, string apiVersion = "2024-04-01-preview", 
+    string resourceName, string apiKey, string apiVersion = "2024-05-01-preview", 
     AzureAuthenticationType authenticationType = AzureAuthenticationType.ApiKey)
 ```
 

src/ChatGptNet/ServiceConfigurations/AzureChatGptServiceConfiguration.cs

@@ -18,7 +18,7 @@ internal class AzureChatGptServiceConfiguration : ChatGptServiceConfiguration
     public string? ResourceName { get; set; }
 
     /// <summary>
-    /// Gets or sets the API version of the Azure OpenAI service (Default: 2024-04-01-preview).
+    /// Gets or sets the API version of the Azure OpenAI service (Default: 2024-05-01-preview).
     /// </summary>
     /// <remarks>
     /// Currently supported versions are: