Bump LibZipSharp to 2.0.4 (#166)

Changes

- Add a new more complex unit test
- [ci] Use new EO compliant build pools
- Bump vcpkg to latest version
- Use RuntimeInformation to determine the Processor architecture

dotnet/android-libzipsharp@2.0.3...2.0.4

Author: dellis1972

src/Microsoft.Android.Build.BaseTasks/MSBuildReferences.projitems

@@ -5,7 +5,7 @@
   <!--Import this file in projects needing to reference Microsoft.Build.*.dll -->
   <PropertyGroup>
     <MSBuildPackageReferenceVersion>16.10.0</MSBuildPackageReferenceVersion>
-    <LibZipSharpVersion Condition=" '$(LibZipSharpVersion)' == '' " >2.0.3</LibZipSharpVersion>
+    <LibZipSharpVersion Condition=" '$(LibZipSharpVersion)' == '' " >2.0.4</LibZipSharpVersion>
     <MonoUnixVersion>7.0.0-final.1.21369.2</MonoUnixVersion>
   </PropertyGroup>