Bump ReactiveUI.Validation from 3.1.7 to 4.0.9

Bumps [ReactiveUI.Validation](https://github.com/reactiveui/reactiveui.validation) from 3.1.7 to 4.0.9.
- [Release notes](https://github.com/reactiveui/reactiveui.validation/releases)
- [Commits](reactiveui/ReactiveUI.Validation@3.1.7...4.0.9)

---
updated-dependencies:
- dependency-name: ReactiveUI.Validation
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

src/WeatherCalendar/WeatherCalendar.csproj

@@ -37,7 +37,7 @@
         <PackageReference Include="NPinyin.Core" Version="3.0.0" />
         <PackageReference Include="ReactiveUI.Events.WPF" Version="15.1.1" />
         <PackageReference Include="ReactiveUI.Fody" Version="19.5.41" />
-        <PackageReference Include="ReactiveUI.Validation" Version="3.1.7" />
+        <PackageReference Include="ReactiveUI.Validation" Version="4.0.9" />
         <PackageReference Include="ReactiveUI.WPF" Version="20.0.1" />
         <PackageReference Include="System.Management" Version="8.0.0" />
         <PackageReference Include="System.Reactive.Linq" Version="6.0.0" />