[Release] Update index.json for extension [ aks-preview ]

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_URL: https://dev.azure.com/azclitools/release/_build/results?buildId=161387&view=results

Last commit: Azure@8d37583

src/index.json

@@ -11114,6 +11114,49 @@
                     "version": "4.0.0b4"
                 },
                 "sha256Digest": "2f6a8ec56fd48237ebf9d48cc5a63507d7360492d72deeb42f62c8acd8527b6b"
+            },
+            {
+                "downloadUrl": "https://azcliprod.blob.core.windows.net/cli-extensions/aks_preview-4.0.0b5-py2.py3-none-any.whl",
+                "filename": "aks_preview-4.0.0b5-py2.py3-none-any.whl",
+                "metadata": {
+                    "azext.isPreview": true,
+                    "azext.minCliCoreVersion": "2.56.0",
+                    "classifiers": [
+                        "Development Status :: 4 - Beta",
+                        "Intended Audience :: Developers",
+                        "Intended Audience :: System Administrators",
+                        "Programming Language :: Python",
+                        "Programming Language :: Python :: 3",
+                        "Programming Language :: Python :: 3.6",
+                        "Programming Language :: Python :: 3.7",
+                        "Programming Language :: Python :: 3.8",
+                        "License :: OSI Approved :: MIT License"
+                    ],
+                    "extensions": {
+                        "python.details": {
+                            "contacts": [
+                                {
+                                    "email": "[email protected]",
+                                    "name": "Microsoft Corporation",
+                                    "role": "author"
+                                }
+                            ],
+                            "document_names": {
+                                "description": "DESCRIPTION.rst"
+                            },
+                            "project_urls": {
+                                "Home": "https://github.com/Azure/azure-cli-extensions/tree/main/src/aks-preview"
+                            }
+                        }
+                    },
+                    "generator": "bdist_wheel (0.30.0)",
+                    "license": "MIT",
+                    "metadata_version": "2.0",
+                    "name": "aks-preview",
+                    "summary": "Provides a preview for upcoming AKS features",
+                    "version": "4.0.0b5"
+                },
+                "sha256Digest": "fff8b68a7a332789345947796cb5014ca2dd8781c38d49c7bdceaf9912490d10"
             }
         ],
         "aksarc": [
@@ -23892,7 +23935,7 @@
                     "version": "1.0.1"
                 },
                 "sha256Digest": "9fcab107f8856e79943388501d148379ab782a1ffba1f997f7db3e667a7d5172"
-            },            
+            },
             {
                 "downloadUrl": "https://software-static.download.prss.microsoft.com/dbazure/888969d5-f34g-4e03-ac9d-1f9786c66749/azure_sphere-1.0.0-py2.py3-none-any.whl",
                 "filename": "azure_sphere-1.0.0-py2.py3-none-any.whl",