Bump Microsoft.Maui.Controls from 9.0.30 to 9.0.40 in /samples (#373)

Bumps [Microsoft.Maui.Controls](https://github.com/dotnet/maui) from 9.0.30 to 9.0.40.
- [Release notes](https://github.com/dotnet/maui/releases)
- [Changelog](https://github.com/dotnet/maui/blob/main/docs/ReleaseSchedule.md)
- [Commits](dotnet/maui@9.0.30...9.0.40)

---
updated-dependencies:
- dependency-name: Microsoft.Maui.Controls
  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>

Directory.Build.props

@@ -20,7 +20,7 @@
     <NuGetAuditMode>all</NuGetAuditMode>
 
     <!-- MAUI Specific -->
-    <MauiPackageVersion>9.0.30</MauiPackageVersion>
+    <MauiPackageVersion>9.0.40</MauiPackageVersion>
     <NextMauiPackageVersion>10.0.0</NextMauiPackageVersion>
     <MauiCommunityToolkitPackageVersion>11.1.0</MauiCommunityToolkitPackageVersion>
     <MauiStrictXamlCompilation>true</MauiStrictXamlCompilation>