build: Raise required wayland-scanner version to 1.23.0 for tests

It's needed for the deprecated-since attribute [1] introduced with [2],
at least when building the tests, which pass the '--strict' parameter to
wayland-scanner.

[1] wayland@ee12e69b


[2] 6c214e6d

Signed-off-by: Heiko Becker <mail@heiko-becker.de>

meson.build

@@ -8,7 +8,11 @@ wayland_protocols_version = meson.project_version()
 
 fs = import('fs')
 
-dep_scanner = dependency('wayland-scanner', version: '>=1.20.0', native: true, fallback: 'wayland')
+dep_scanner = dependency('wayland-scanner',
+    version: get_option('tests') ? '>=1.23.0' : '>=1.20.0',
+    native: true,
+    fallback: 'wayland'
+)
 prog_scanner = find_program(dep_scanner.get_variable(pkgconfig: 'wayland_scanner', internal: 'wayland_scanner'))
 
 stable_protocols = {