build(deps): bump Xamarin.Forms in /integrationtests (#3443)

Bumps Xamarin.Forms from 5.0.0.2515 to 5.0.0.2545.

---
updated-dependencies:
- dependency-name: Xamarin.Forms
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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src/ReactiveUI.XamForms/ReactiveUI.XamForms.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2515" />
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2545" />
   </ItemGroup>
 
   <ItemGroup>