build: update required GTK version to 4.20

Author: FineFindus

Cargo.toml

@@ -19,7 +19,7 @@ strip = true
 
 [dependencies]
 gettext-rs = { version = "0.7", features = ["gettext-system"] }
-gtk = { version = "0.10", package = "gtk4", features = ["v4_18"] }
+gtk = { version = "0.10", package = "gtk4", features = ["v4_20"] }
 adw = { package = "libadwaita", version = "0.8", features = ["v1_8"] }
 tracing = "0.1"
 tracing-subscriber = "0.3"

meson.build

@@ -12,7 +12,7 @@ base_id = 'io.github.finefindus.Hieroglyphic'
 
 dependency('glib-2.0', version: '>= 2.70')
 dependency('gio-2.0', version: '>= 2.70')
-dependency('gtk4', version: '>= 4.18.0')
+dependency('gtk4', version: '>= 4.20.0')
 dependency('libadwaita-1', version: '>= 1.8')
 
 find_program('glib-compile-resources', required: true)