Update Flatpak YAML to null

Author: github-actions[bot]

flatpak/so.asimov.cli.yaml

@@ -13,15 +13,15 @@ modules:
 
     sources:
       - type: file
-        url: "https://github.com/asimov-platform/asimov-cli/releases/download/25.0.0-dev.4/asimov-linux-x86-gnu.gz"
-        sha256: "6b6e54fd490e036d864158de7d4b19a248aaf64c926ff9d3daa9db0f463d6f9c"
+        url: "https://github.com/asimov-platform/asimov-cli/releases/download/null/asimov-linux-x86-gnu.gz"
+        sha256: "Not"
         only-arches:
           - x86_64
         dest-filename: "asimov.gz"
 
       - type: file
-        url: "https://github.com/asimov-platform/asimov-cli/releases/download/25.0.0-dev.4/asimov-linux-arm-gnu.gz"
-        sha256: "ef21144725eeccd0618357f0bb4936d1653a8968bfa8b530fa2490685470dc33"
+        url: "https://github.com/asimov-platform/asimov-cli/releases/download/null/asimov-linux-arm-gnu.gz"
+        sha256: "Not"
         only-arches:
           - aarch64
         dest-filename: "asimov.gz"