73899 Restore adaptive nature to new Scrollbar (cla: yes, f: material design, f: scrolling, framework, waiting for tree to go green)

73900 Added CupertinoButton alignment property (cla: yes, f: cupertino, framework)

73925 Apply ListTile colors to leading and trailing text widgets (cla: yes, f: material design, framework, waiting for tree to go green)

73985 [flutter_releases] Flutter 1.25.0-8.3.pre framework cherrypicks (cla: yes, engine, f: cupertino, framework, team, tool)

73989 Add fixes for Stack deprecation (cla: yes, framework, team, waiting for tree to go green)

73992 BorderTween.lerp supports null begin/end values (cla: yes, f: cupertino, framework)