[flatpak] update frei0r for alpha render fix

packaging/flatpak/org.kde.kdenlive-nightly.json

@@ -290,9 +290,9 @@
       ],
       "sources": [
         {
-          "type": "archive",
-          "url": "https://files.dyne.org/frei0r/releases/frei0r-plugins-1.7.0.tar.gz",
-          "sha256": "1b1ff8f0f9bc23eed724e94e9a7c1d8f0244bfe33424bb4fe68e6460c088523a"
+          "type": "git",
+          "url": "https://github.com/dyne/frei0r.git",
+          "commit": "febd73874dab6be330398a3b55112451b36ee939"
         }
       ]
     },