Switch to new download format and update check-version.sh script

pkg.info

@@ -1,9 +1,11 @@
 name: adwaita-icon-theme
 description: UI icon set for GNOME core apps
 version: "49.0"
-revision: 1
+revision: 2
 url: https://gitlab.gnome.org/GNOME/adwaita-icon-theme
 license: CC-BY-SA-3.0 or LGPL3-only
+maintainers:
+  - [email protected]
 architecture: any
 output_architecture: any
 type: source
@@ -11,3 +13,8 @@ depends:
   - gtk3
 make_depends:
   - meson
+downloads:
+  - url: https://download.gnome.org/sources/adwaita-icon-theme/${BPM_PKG_VERSION%.*}/adwaita-icon-theme-${BPM_PKG_VERSION}.tar.xz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 65166461d1b278aa942f59aa8d0fccf1108d71c65f372c6266e172449791755c