Use more efficient (and not obsolete) download method.

Author: JimBobSquarePants

src/ImageSharp.Web.Providers.Azure/Resolvers/AzureBlobStorageCacheResolver.cs

@@ -33,7 +33,6 @@ public async Task<ImageCacheMetadata> GetMetaDataAsync()
         }
 
         /// <inheritdoc/>
-        public async Task<Stream> OpenReadAsync()
-            => (await this.blob.DownloadAsync()).Value.Content;
+        public Task<Stream> OpenReadAsync() => this.blob.OpenReadAsync();
     }
 }

src/ImageSharp.Web.Providers.Azure/Resolvers/AzureBlobStorageImageResolver.cs

@@ -47,7 +47,6 @@ public async Task<ImageMetadata> GetMetaDataAsync()
         }
 
         /// <inheritdoc/>
-        public async Task<Stream> OpenReadAsync()
-            => (await this.blob.DownloadAsync()).Value.Content;
+        public Task<Stream> OpenReadAsync() => this.blob.OpenReadAsync();
     }
 }