[Release] Update index.json for extension [ storage-preview ] (Azure#3446)

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_ID=919948

Last commit: Azure@9d1678e

Author: Azure CLI Bot

src/index.json

@@ -17361,6 +17361,59 @@
                     "version": "0.7.2"
                 },
                 "sha256Digest": "768aecf13a62b06fd26b9d15078da74c38541a2793208b8c434afc55b39c2c64"
+            },
+            {
+                "downloadUrl": "https://azcliprod.blob.core.windows.net/cli-extensions/storage_preview-0.7.3-py2.py3-none-any.whl",
+                "filename": "storage_preview-0.7.3-py2.py3-none-any.whl",
+                "metadata": {
+                    "azext.isPreview": true,
+                    "azext.minCliCoreVersion": "2.21.0",
+                    "classifiers": [
+                        "Development Status :: 4 - Beta",
+                        "Intended Audience :: Developers",
+                        "Intended Audience :: System Administrators",
+                        "Programming Language :: Python",
+                        "Programming Language :: Python :: 2",
+                        "Programming Language :: Python :: 2.7",
+                        "Programming Language :: Python :: 3",
+                        "Programming Language :: Python :: 3.4",
+                        "Programming Language :: Python :: 3.5",
+                        "Programming Language :: Python :: 3.6",
+                        "License :: OSI Approved :: MIT License"
+                    ],
+                    "extensions": {
+                        "python.details": {
+                            "contacts": [
+                                {
+                                    "email": "azpycli@microsoft.com",
+                                    "name": "Microsoft Corporation",
+                                    "role": "author"
+                                }
+                            ],
+                            "document_names": {
+                                "description": "DESCRIPTION.rst"
+                            },
+                            "project_urls": {
+                                "Home": "https://github.com/Azure/azure-cli-extensions/tree/master/src/storage-preview"
+                            }
+                        }
+                    },
+                    "extras": [],
+                    "generator": "bdist_wheel (0.30.0)",
+                    "license": "MIT",
+                    "metadata_version": "2.0",
+                    "name": "storage-preview",
+                    "run_requires": [
+                        {
+                            "requires": [
+                                "azure-core"
+                            ]
+                        }
+                    ],
+                    "summary": "Provides a preview for upcoming storage features.",
+                    "version": "0.7.3"
+                },
+                "sha256Digest": "ec0e700f8ba51eca45198d5907d056780946e0b5ffa593d264598679e949dcb1"
             }
         ],
         "storagesync": [