Use shared libsecret

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "shared-modules"]
+	path = shared-modules
+	url = https://github.com/flathub/shared-modules.git

com.visualstudio.code.yaml

@@ -34,17 +34,7 @@ cleanup:
   - '*.la'
 modules:
 
-  - name: libsecret
-    buildsystem: meson
-    config-opts:
-      - -Dmanpage=false
-      - -Dgtk_doc=false
-      - -Dvapi=false
-    cleanup: [/bin]
-    sources:
-      - type: archive
-        url: https://ftp.gnome.org/pub/GNOME/sources/libsecret/0.19/libsecret-0.19.1.tar.xz
-        sha256: 8583e10179456ae2c83075d95455f156dc08db6278b32bf4bd61819335a30e3a
+  - shared-modules/libsecret/libsecret.json
 
   - name: vscode
     buildsystem: simple