Change deprecated TextButton to HyperlinkButton

[miquelbeltran]

Change the deprecated use of TextButton to HyperlinkButton in fluent_ui sample.

The error was:

Analyzing fluent_ui...

   info - lib/src/widgets/photo_details.dart:40:45 - 'TextButton' is deprecated and shouldn't be used. Deprecated in 4.4.3. Use HypelinkButton instead. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - lib/src/widgets/photo_details.dart:48:45 - 'TextButton' is deprecated and shouldn't be used. Deprecated in 4.4.3. Use HypelinkButton instead. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use

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.

[miquelbeltran]

This PR fixes Stable CI. I've seen that this change is also not applied in the beta branch, in case you want to merge it there as well.