chore: adjust FileChooser portal version check (backport #20716)

[mergify[bot]]

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GitHub Issue: closes #

PR Type:

What is the current behavior? 🤔

What is the new behavior? 🚀

PR Checklist ✅

Please check if your PR fulfills the following requirements:

• [ ] 📝 Commits must be following the Conventional Commits specification.
• [ ] 🧪 Added Runtime tests, UI tests, or a manual test sample for the changes have been added (for bug fixes / features) (if applicable)
• [ ] 📚 Docs have been added/updated which fit documentation template (for bug fixes / features)
• [ ] 🖼️ Validated PR Screenshots Compare Test Run results.
• [ ] ❗ Contains NO breaking changes

Other information ℹ️

---

This is an automatic backport of pull request #20716 done by [Mergify](https://mergify.com).

[mergify[bot]]

Cherry-pick of fb13a934922329d98d5077082676df522c474db3 has failed:

On branch mergify/bp/release/stable/6.0/pr-20716
Your branch is up to date with 'origin/release/stable/6.0'.

You are currently cherry-picking commit fb13a93492.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/Uno.UI.Runtime.Skia.X11/LinuxFilePickerExtension.cs
	both modified:   src/Uno.UI.Runtime.Skia.X11/LinuxFileSaverExtension.cs

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-20732/docs/index.html

[unodevops]

🤖 Your WebAssembly Native Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-20732/wasm-native-net9/index.html

[unodevops]

⚠️⚠️ The build 167882 has failed on Uno.UI - CI.