housekeeping: Upgraded Xamarin.Forms to v4.8 (#2640)

Author: RLittlesII

integrationtests/IntegrationTests.XamarinForms/IntegrationTests.XamarinForms.csproj

@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="Acr.UserDialogs" Version="7.1.0.470" />
     <PackageReference Include="ReactiveUI.XamForms" Version="*" />
-    <PackageReference Include="Xamarin.Forms" Version="4.7.*" />
+    <PackageReference Include="Xamarin.Forms" Version="4.8.*" />
   </ItemGroup>
 
   <ItemGroup>

src/ReactiveUI.Events.XamForms/ReactiveUI.Events.XamForms.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="4.7.*" />
+    <PackageReference Include="Xamarin.Forms" Version="4.8.*" />
     <PackageReference Include="Pharmacist.MsBuild" Version="2.*" PrivateAssets="all" />
     <PackageReference Include="Pharmacist.Common" Version="2.*" />
    </ItemGroup>

src/ReactiveUI.XamForms/ReactiveUI.XamForms.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="4.7.*" />
+    <PackageReference Include="Xamarin.Forms" Version="4.8.*" />
   </ItemGroup>
 
   <ItemGroup>