ci: 修复 MinGW 包名错误

- 使用正确的 Debian 包名：gcc-mingw-w64-x86-64
- 移除不存在的 x86_64-w64-mingw32-posix-runtime 包

.gitea/workflows/build.yml

@@ -29,11 +29,7 @@ jobs:
     - name: Install MinGW
       run: |
         apt-get update
-        apt-get install -y mingw-w64 x86_64-w64-mingw32-posix-runtime libssl-dev pkg-config
-        
-    - name: Install GTK dependencies
-      run: |
-        apt-get install -y libgtk-3-dev libwebkit2gtk-4.0-dev libappindicator3-dev librsvg2-dev libjavascriptcoregtk-4.0-dev libsoup2.4-dev
+        apt-get install -y gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 binutils-mingw-w64-x86-64
         
     - name: Build
       run: |