Merge pull request #2 from Open-NET-Libraries/dependabot/nuget/System.Threading.Tasks.Extensions-4.5.4

Bump System.Threading.Tasks.Extensions from 4.5.2 to 4.5.4

Author: electricessence

Open.Disposable.csproj

@@ -47,7 +47,7 @@ Part of the "Open" set of libraries.
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.2" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1' ">