Fix netstandard2.0 issue with GetManifestResourceStream

Author: paulirwin

test/F23.StringSimilarity.Tests/CosineTest.cs

@@ -153,7 +153,8 @@ private static async Task<string> ReadResourceFileAsync(string file)
             var assembly = Assembly.GetExecutingAssembly();
             var resourceName = $"{typeof(CosineTest).Namespace}.{file}";
 
-            await using var stream = assembly.GetManifestResourceStream(resourceName);
+            // ReSharper disable once UseAwaitUsing - not supported on netstandard2.0
+            using var stream = assembly.GetManifestResourceStream(resourceName);
 
             Debug.Assert(stream != null, "stream != null");