fix: use flutter_build action instead of gradle action (#25)

plugins/fastlane-plugin-android_cd/lib/fastlane/plugin/android_cd/actions/build_and_deploy_action.rb

@@ -20,18 +20,9 @@ module Fastlane
         # Clean the project before building
         other_action.gradle(task: "clean")
 
-        # Set the build number based on the number of commits
-        build_number = other_action.number_of_commits
-
         # Build the Android App Bundle
-        other_action.gradle(
-          task: "bundle",
-          build_type: "Release",
-          print_command: true,
-          project_dir: './',
-          properties: {
-            "android.injected.version.code" => build_number
-          }
+        other_action.flutter_build(
+          build: 'appbundle'
         )
 
         UI.message("👉🏼 App built")