feat: Bump to iOS 17 SDK

Since April 29, 2024, iOS apps must be built with the iOS 17 SDK or
later in order to be uploaded to App Store Connect

To enable iOS 17 SDK we must use XCode 15 that is linked to MacOS 13
and 14

So we want to run the Github Action in `macos-14` in order to have the
correct environment

Unfortunately the `macos-14` runner doesn't include Xamarin tools
anymore, so now we have to install them manually (that will increase
the CI built time by a few minutes)

Related articles:
- https://xcodereleases.com/
- https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md

Author: Ldoppea

.github/workflows/build.yml

@@ -8,12 +8,18 @@ on:
 jobs:
   ios:
     name: Apple iOS
-    runs-on: macos-12
+    runs-on: macos-14
     steps:
+      - run: brew install --cask xamarin-ios
+        name: 'Install Xamarin.iOS package using Homebrew'
+
+      - run: brew install --cask xamarin-android
+        name: 'Install Xamarin.Android package using Homebrew'
+
       - name: Setup NuGet
         uses: nuget/setup-nuget@296fd3ccf8528660c91106efefe2364482f86d6f # v1.2.0
         with:
-          nuget-version: 5.9.0
+          nuget-version: 6.4.0
 
       - name: Print environment
         run: |