wayland-protocols: upgrade 1.26 -> 1.27

wayland-protocols 1.27 is now available.

This release includes two new staging protocols:

 * Content type hint

This protocol enables clients to provide hints to the compositor about
what kind of content it provides, allowing compositors to optionally
adapt its behavior accordingly.

 * Idle notify

This extension allows compositors to notify clients about when the user
is idle.

Apart from these two new extensions, this release also brings the usual
clarifications, cleanups and fixes. Enjoy!

Daniel Stone (1):
      xdg-shell: ack_configure must be strictly monotonic

Emmanuel Gil Peyrot (1):
      staging/content-type: Content type hint support

Isaac Freund (1):
      ext-session-lock: add note on client termination

Jonas Ådahl (1):
      build: Bump version to 1.27

Simon Ser (3):
      xdg-shell: forbid loops in set_parent
      ext-idle-notify: new protocol
      build: alphabetically sort list of staging protocols

Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>