[markdown] CI is failing

[mosuem]

See https://github.com/dart-lang/tools/actions/runs/13610183977:

Run dart analyze --fatal-infos
Analyzing markdown...

   info - example/app.dart:43:15 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:46:25 - '[]' is deprecated and shouldn't be used. Use Storage.getItem instead. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:60:37 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:85:5 - '[]=' is deprecated and shouldn't be used. Use Storage.setItem instead. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:113:43 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:117:48 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:121:41 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use
   info - example/app.dart:125:37 - 'text' is deprecated and shouldn't be used. See Node.textContent. Try replacing the use of the deprecated member with the replacement. - deprecated_member_use

cc @bwilkerson for the analysis team

[mosuem]

Trying to find a more permanent way of fixing this - see also bmw-tech/dart_apitool#205