84017 Mixed null safety in dev/devicelab (team, f: material design, a: accessibility, cla: yes, waiting for tree to go green, a: null-safety)

84020 Update the Windows runner for Gallery (team, cla: yes, waiting for tree to go green)

84061 migrate mega_gallery to null safety (team, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)

84063 migrate update_icons to null safety (team, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)

84064 migrate localization to null safety (team, f: material design, cla: yes, f: cupertino, a: null-safety, tech-debt)