Updating Hangfire.Core from 1.6.13 to 1.7.9

Author: SkinnySackboy

src/Hangfire.MemoryStorage/Hangfire.MemoryStorage.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Hangfire.Core" Version="1.6.13" />
+    <PackageReference Include="Hangfire.Core" Version="1.7.9" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">