fix: revert flutter version to v3.16.8 (#821)

.github/workflows/test.yml

@@ -28,7 +28,7 @@ on:
 
 env:
   GO_VERSION: "1.23"
-  FLUTTER_VERSION: "3.24.3"
+  FLUTTER_VERSION: "3.16.8"
 
 jobs:
   #  lint:
@@ -73,17 +73,17 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           flutter-version: ${{ env.FLUTTER_VERSION }}
-      - if: runner.os == 'windows-latest'
+      - if: runner.os == 'windows'
         run: |
           go build -tags nosqlite -ldflags="-w -s" -buildmode=c-shared -o ui/flutter/windows/libgopeed.dll github.com/GopeedLab/gopeed/bind/desktop
           cd ui/flutter
           flutter build windows
-      - if: runner.os == 'macos-latest'
+      - if: runner.os == 'macOS'
         run: |
           go build -tags nosqlite -ldflags="-w -s" -buildmode=c-shared -o ui/flutter/macos/Frameworks/libgopeed.dylib github.com/GopeedLab/gopeed/bind/desktop
           cd ui/flutter
           flutter build macos
-      - if: runner.os == 'ubuntu-latest'
+      - if: runner.os == 'Linux'
         run: |
           sudo apt-get update -y
           sudo apt-get install -y ninja-build libgtk-3-dev libayatana-appindicator3-dev