Update nuget_localization.xamarin.yml

Author: fmazzant

.github/workflows/nuget_localization.xamarin.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v2
       with:
-        dotnet-version: 76.0.x
+        dotnet-version: 7.0.x
 
     - name: Restore dependencies
       run: dotnet restore src/Localization.Xamarin/Localization.Xamarin.csproj