22248 [web] fix type error during hot restart in font manager (cla: yes)

22250 Roll Skia from 7585a65ac709 to dffd20efe95c (14 revisions) (cla: yes, waiting for tree to go green)

22251 fix _getArrayBuffer signature (cla: yes)

22252 [web] Fix nullability issue with Image.network (cla: yes)

22255 Roll Dart SDK from 5acb5fcf84cb to a9d583383410 (4 revisions) (cla: yes, waiting for tree to go green)

22256 [web] Add test for Image.network (cla: yes)

22257 do not print in _computePixelDensity (cla: yes, waiting for tree to go green)