Stick to specific commit in wayland-protocols
This is needed because kwin fails to build with current latest wayland-protocols commit.
See discussion here: https://matrix.to/#/!cbhzHdSgDDghlosjCd:kde.org/$2s1Wz-PQDhavt0VgTQ0SF6TBx5Km6aI_D61IQs6t9d4?via=matrix.org&via=kde.org&via=im.kde.org