build: Specify required GTK version

Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/714>

plugins/provider/dummy/meson.build

@@ -44,7 +44,7 @@ i18n_plugin = i18n.merge_file(
 
 dummy_deps = [
   dependency('gobject-2.0'),
-  dependency('gtk4'),
+  dependency('gtk4', version: '>= @0@'.format(gtk_version)),
   dependency('libpeas-1.0'),
 ]
 

plugins/provider/mm/meson.build

@@ -42,7 +42,7 @@ i18n_plugin = i18n.merge_file(
 
 mm_deps = [
   dependency('gobject-2.0'),
-  dependency('gtk4'),
+  dependency('gtk4', version: '>= @0@'.format(gtk_version)),
   dependency('ModemManager'),
   dependency('mm-glib', version: '>= 1.12.0'),
   dependency('libpeas-1.0'),

plugins/provider/ofono/meson.build

@@ -43,7 +43,7 @@ i18n_plugin = i18n.merge_file(
 
 ofono_deps = [
   dependency('gobject-2.0'),
-  dependency('gtk4'),
+  dependency('gtk4', version: '>= @0@'.format(gtk_version)),
   dependency('libpeas-1.0'),
 ]