bump: flutter (#949)

* bump: flutter

fix update.rhai

Signed-off-by: madomado <madonuko@outlook.com>

* Update flutter.spec

Signed-off-by: madomado <madonuko@outlook.com>

---------

Signed-off-by: madomado <madonuko@outlook.com>

anda/devs/flutter/flutter.spec

@@ -1,5 +1,5 @@
 Name:			flutter
-Version:		3.20.0.1.1.pre
+Version:		3.19.0
 Release:		1%?dist
 Summary:		SDK for crafting beautiful, fast user experiences from a single codebase
 License:		BSD-3-Clause

anda/devs/flutter/update.rhai

@@ -1,2 +1,7 @@
 let obj = get("https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json").json();
-rpm.version(obj.releases[0].version);
+for release in obj.releases {
+  if release.channel == "stable" {
+    rpm.version(release.version);
+    break;
+  }
+}