24244 Reland “[metal] Darwin unified external metal textures (#24157)” (cla: yes, platform-ios)

24246 Pin the package_config package used by generate_package_config at version 1.9.3 (cla: yes)

24249 Roll CanvasKit to 0.23 (cla: yes, platform-web)

24250 [flutter_releases] clarify comment (cla: yes)

24251 [flutter_releases] Pin the package_config package (cla: yes)

24252 Roll buildroot to 739be241578e7f12773eedb713df7fe3b0ec917b (cla: yes)