Bump wayland-protocols version for idle-inhibit

This prevents GLFW from building when wayland-protocols is too old.

CMakeLists.txt

@@ -278,7 +278,7 @@ if (_GLFW_WAYLAND)
 
     find_package(Wayland REQUIRED Client Cursor Egl)
     find_package(WaylandScanner REQUIRED)
-    find_package(WaylandProtocols 1.1 REQUIRED)
+    find_package(WaylandProtocols 1.6 REQUIRED)
 
     list(APPEND glfw_PKG_DEPS "wayland-egl")