feat(manager/asdf): support channel suffix on asdf-flutter

lib/modules/manager/asdf/extract.spec.ts

@@ -60,7 +60,7 @@ ecspresso 2.1.0
 elixir 1.14.1
 elm 0.19.1
 erlang 25.1.2
-flutter 3.7.6
+flutter 3.7.6-stable
 flux2 0.41.2
 gauche 0.9.12
 gohugo extended_0.104.3
@@ -516,6 +516,29 @@ dummy 1.2.3
       });
     });
 
+    it('can handle flutter version channel', () => {
+      const withChannel = extractPackageFile('flutter 3.10.0-stable');
+      expect(withChannel).toEqual({
+        deps: [
+          {
+            currentValue: '3.10.0',
+            datasource: 'flutter-version',
+            depName: 'flutter',
+          },
+        ],
+      });
+      const withoutChannel = extractPackageFile('flutter 3.10.0');
+      expect(withoutChannel).toEqual({
+        deps: [
+          {
+            currentValue: '3.10.0',
+            datasource: 'flutter-version',
+            depName: 'flutter',
+          },
+        ],
+      });
+    });
+
     it('can handle java jre / jdk', () => {
       const jdkRes = extractPackageFile('java adoptopenjdk-16.0.0+36');
       expect(jdkRes).toEqual({

lib/modules/manager/asdf/upgradeable-tooling.ts

@@ -1,3 +1,4 @@
+import { regEx } from '../../../util/regex';
 import { DartVersionDatasource } from '../../datasource/dart-version';
 import { DockerDatasource } from '../../datasource/docker';
 import { FlutterVersionDatasource } from '../../datasource/flutter-version';
@@ -158,9 +159,11 @@ export const upgradeableTooling: Record<string, ToolingDefinition> = {
   },
   flutter: {
     asdfPluginUrl: 'https://github.com/oae/asdf-flutter',
-    config: {
+    config: (version) => ({
       datasource: FlutterVersionDatasource.id,
-    },
+      // asdf-flutter plugin supports channel on version suffix.
+      currentValue: version.replace(regEx(/-(stable|beta|dev)$/), ''),
+    }),
   },
   flux2: {
     asdfPluginUrl: 'https://github.com/tablexi/asdf-flux2.git',