Bump Xamarin.Essentials from 1.7.7 to 1.8.0

Bumps [Xamarin.Essentials](https://github.com/xamarin/Essentials) from 1.7.7 to 1.8.0.
- [Release notes](https://github.com/xamarin/Essentials/releases)
- [Commits](xamarin/Essentials@1.7.7...1.8.0)

---
updated-dependencies:
- dependency-name: Xamarin.Essentials
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/CrissCross.XamForms.Test/CrissCross.XamForms.Test/CrissCross.XamForms.Test.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="ReactiveUI.Fody" Version="$(ReactiveUIVersion)" />
-    <PackageReference Include="Xamarin.Essentials" Version="1.7.7" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.8.0" />
   </ItemGroup>
 
   <ItemGroup>