21892 Roll Skia from f4bda743ff8d to f1b53836b705 (21 revisions) (cla: yes, waiting for tree to go green)

21896 Show OSK on GNOME+Wayland (cla: yes)

21897 Add multi-step input method support for Linux (affects: desktop, affects: text input, cla: yes, needs tests, platform-linux)

21901 [web] Implement ClipOp.difference (cla: yes)

21904 Eliminate FLUTTER_NOLINT where possible (cla: yes, code health, platform-android)

21906 Roll Fuchsia Mac SDK from SFNhlfVb_… to _FaRRt69Z… (cla: yes, waiting for tree to go green)