Fix desktop_photo_search/fluent_ui (#1747)

**Breakfix**

*Replace this paragraph with a description of what this PR is changing
or adding, and why. Consider including before/after screenshots.*

*List which issues are fixed by this PR. For larger changes, raising an
issue first helps
reduce redundant work.*

## Pre-launch Checklist

- [ ] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [ ] I signed the [CLA].
- [ ] I read the [Contributors Guide].
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
[Discord]: https://github.com/flutter/flutter/wiki/Chat
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

desktop_photo_search/fluent_ui/pubspec.yaml

@@ -11,7 +11,9 @@ dependencies:
   built_value: ^8.3.0
   cupertino_icons: ^1.0.2
   file_selector: ^0.9.1
-  fluent_ui: ^4.0.0
+  # TODO: revert to published version when 'pkg:intl' fix is available.
+  fluent_ui:
+    git: https://github.com/bdlukaa/fluent_ui
   fluentui_system_icons: ^1.1.168
   flutter:
     sdk: flutter