build(deps): bump Xamarin.AndroidX.AppCompat in /integrationtests (#3071)

Bumps [Xamarin.AndroidX.AppCompat](https://github.com/xamarin/AndroidX) from 1.3.1.3 to 1.3.1.4.
- [Release notes](https://github.com/xamarin/AndroidX/releases)
- [Commits](https://github.com/xamarin/AndroidX/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

src/ReactiveUI.AndroidX/ReactiveUI.AndroidX.csproj

@@ -17,7 +17,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.Runtime.Serialization.Primitives" Version="4.3.0" />
-    <PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.3.1.3" />
+    <PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.3.1.4" />
     <PackageReference Include="Xamarin.AndroidX.Fragment" Version="1.3.6.4" />
     <PackageReference Include="Xamarin.AndroidX.Preference" Version="1.1.1.11" />
     <PackageReference Include="Xamarin.AndroidX.RecyclerView" Version="1.2.1.4" />