Improve NRT annotations and update Foundatio to 13.0.0-beta6.2

- Add [DisallowNull] to connection string options property

Author: niemyjski

src/Foundatio.Aliyun/Foundatio.Aliyun.csproj

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageReference Include="Aliyun.OSS.Sdk.NetCore" Version="2.14.1" />
 
-    <PackageReference Include="Foundatio" Version="13.0.0-beta6" Condition="'$(ReferenceFoundatioSource)' == '' OR '$(ReferenceFoundatioSource)' == 'false'" />
+    <PackageReference Include="Foundatio" Version="13.0.0-beta6.2" Condition="'$(ReferenceFoundatioSource)' == '' OR '$(ReferenceFoundatioSource)' == 'false'" />
     <ProjectReference Include="..\..\..\Foundatio\src\Foundatio\Foundatio.csproj" Condition="'$(ReferenceFoundatioSource)' == 'true'" />
   </ItemGroup>
 </Project>

src/Foundatio.Aliyun/Storage/AliyunFileStorageOptions.cs

@@ -9,11 +9,9 @@ public class AliyunFileStorageOptions : SharedOptions
 
 public class AliyunFileStorageOptionsBuilder : SharedOptionsBuilder<AliyunFileStorageOptions, AliyunFileStorageOptionsBuilder>
 {
-    public AliyunFileStorageOptionsBuilder ConnectionString(string connectionString)
+    public AliyunFileStorageOptionsBuilder ConnectionString(string? connectionString)
     {
-        if (String.IsNullOrEmpty(connectionString))
-            throw new ArgumentNullException(nameof(connectionString));
-        Target.ConnectionString = connectionString;
+        Target.ConnectionString = String.IsNullOrEmpty(connectionString) ? null : connectionString;
         return this;
     }
 }