Update package version to 2.88.0

pkg.info

@@ -1,9 +1,23 @@
 name: glibmm-2.68
 description: Official C++ interface for the popular cross-platform library Glib
-version: 2.86.0
+version: 2.88.0
+revision: 1
 url: https://www.gtkmm.org/
 license: LGPL2.1-or-later
+maintainers:
+  - [email protected]
 architecture: any
-depends: ["glib","libsigcpp-3.0"]
-make_depends: ["meson","mm-common","libxslt","glib-networking"]
 type: source
+depends:
+  - glib
+  - libsigcpp-3.0
+make_depends:
+  - meson
+  - mm-common
+  - libxslt
+  - glib-networking
+downloads:
+  - url: https://download.gnome.org/sources/glibmm/${BPM_PKG_VERSION%.*}/glibmm-${BPM_PKG_VERSION}.tar.xz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: a6549da3a6c43de83b8717dae5413c57a60d92f6ecc624615c612d0bb0ad0fe2