feature update gtk version.

.github/workflows/build_all.yml

@@ -73,7 +73,7 @@ jobs:
       group: flatpak-${{ matrix.variant.arch }}-${{ github.event.pull_request.number || github.ref }}
       cancel-in-progress: false
     container:
-      image: ghcr.io/flathub-infra/flatpak-github-actions:gnome-51
+      image: ghcr.io/flathub-infra/flatpak-github-actions:gnome-48
       options: --privileged
       volumes:
         - /usr/local/lib/android:/usr/local/lib/android

scripts/flatpak/io.github.Snapmaker.Snapmaker_Orca.yml

@@ -1,6 +1,6 @@
 app-id: io.github.Snapmaker.Snapmaker_Orca
 runtime: org.gnome.Platform
-runtime-version: "51"
+runtime-version: "48"
 sdk: org.gnome.Sdk
 command: entrypoint
 separate-locales: true