Bump AkkaVersion from 1.4.5 to 1.4.6 (#139)

Author: dependabot-preview[bot]

src/common.props

@@ -14,7 +14,7 @@
   <PropertyGroup>
     <XunitVersion>2.4.1</XunitVersion>
     <TestSdkVersion>16.6.1</TestSdkVersion>
-    <AkkaVersion>1.4.5</AkkaVersion>
+    <AkkaVersion>1.4.6</AkkaVersion>
   </PropertyGroup>
   <!-- SourceLink support for all Akka.NET projects -->
   <ItemGroup>