Bump Akka.NET from 1.5.4 to 1.5.5 (#295)

Author: Arkatufus

src/Directory.Build.props

@@ -134,7 +134,7 @@ hostBuilder.Services.AddAkka("MyActorSystem"%2C builder =>
         <TestSdkVersion>17.5.0</TestSdkVersion>
         <CoverletVersion>3.2.0</CoverletVersion>
 	    <XunitRunneVisualstudio>2.4.5</XunitRunneVisualstudio>
-        <AkkaVersion>1.5.4</AkkaVersion>
+        <AkkaVersion>1.5.5</AkkaVersion>
         <MicrosoftExtensionsVersion>[3.0.0,)</MicrosoftExtensionsVersion>
     </PropertyGroup>