Update Akka versions to 1.5.51 (#546)

Author: Aaronontheweb

src/Directory.Packages.props

@@ -1,8 +1,8 @@
 <Project>
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-    <AkkaVersion>1.5.44</AkkaVersion>
-    <AkkaHostingVersion>1.5.44</AkkaHostingVersion>
+    <AkkaVersion>1.5.51</AkkaVersion>
+    <AkkaHostingVersion>1.5.51</AkkaHostingVersion>
     <FluentMigratorVersion>5.2.0</FluentMigratorVersion>
     <SqliteVersion>1.0.118</SqliteVersion>
     <MicrosoftSqliteVersion>8.0.7</MicrosoftSqliteVersion>
@@ -82,4 +82,4 @@
   <ItemGroup>
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
   </ItemGroup>
-</Project>
+</Project>