[gnome-builder] plugins/meson-templates: Upgrade libadwaita-rs to 0.2.0-alpha.2

[Christian Hergert <chergert src gnome org>]

commit 7401150071be4277b83e028a71d9425cab3ff8e9
Author: William Roy <wroy pm me>
Date:   Sat Jul 30 14:24:49 2022 +0000

    plugins/meson-templates: Upgrade libadwaita-rs to 0.2.0-alpha.2
    
    Fix https://gitlab.gnome.org/GNOME/gnome-builder/-/issues/1717

 src/plugins/meson-templates/resources/src/Cargo-gtk4.toml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/meson-templates/resources/src/Cargo-gtk4.toml 
b/src/plugins/meson-templates/resources/src/Cargo-gtk4.toml
index ae529f6a3..b692b2b41 100644
--- a/src/plugins/meson-templates/resources/src/Cargo-gtk4.toml
+++ b/src/plugins/meson-templates/resources/src/Cargo-gtk4.toml
@@ -10,5 +10,6 @@ gtk = { version = "0.4.7", package = "gtk4" }
 {{if is_adwaita}}
 [dependencies.adw]
 package = "libadwaita"
-version  = "0.1.1"
+version = "0.2.0-alpha.2"
+features = ["v1_2"]
 {{end}}