build(deps): Bump Xamarin.Essentials from 1.7.7 to 1.8.0 (#770)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Xamarin/MasterDetail/MasterDetail.Android/MasterDetail.Android.csproj

@@ -55,7 +55,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.2578" />
-    <PackageReference Include="Xamarin.Essentials" Version="1.7.7" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.8.0" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="MainActivity.cs" />