chore(deps): update dependency reactiveui.androidx to 20.3.1 (#786)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/ReactiveUI.Validation.AndroidX/ReactiveUI.Validation.AndroidX.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ReactiveUI.AndroidX" Version="20.2.45" />
+    <PackageReference Include="ReactiveUI.AndroidX" Version="20.3.1" />
   </ItemGroup>
 
   <ItemGroup>