Update input-method protocol

Epic: https://source.puri.sm/Librem5/use-cases/issues/22

Bump the input-method protocol to a newer draft.

This should go in after https://github.com/swaywm/wlroots/pull/1203 is merged (done) and appears in our rootston ( wlroots!35 (closed) ).

Blocked by wlroots!35 (closed) phoc#14 (closed)