feat(sf): revert to v6 (#155)

Author: loekd

src/ServiceFabric.Mocks/ServiceFabric.Mocks.csproj

@@ -38,7 +38,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ServiceFabric.Actors" Version="7.0.1001" />
+    <PackageReference Include="Microsoft.ServiceFabric.Actors" Version="6.1.1436" />
   </ItemGroup>
 
 </Project>

test/ServiceFabric.Mocks.NetCoreTests/ServiceFabric.Mocks.NetCoreTests.csproj

@@ -36,7 +36,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ServiceFabric.Actors" Version="7.0.1001" />
+    <PackageReference Include="Microsoft.ServiceFabric.Actors" Version="6.1.1436" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.0.2" />
     <PackageReference Include="MSTest.TestFramework" Version="3.0.2" />