Remove unnecessary boost

Author: wengxt

.github/workflows/check.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - name: Install dependencies
         run: |
-          pacman -Syu --noconfirm base-devel clang cmake ninja extra-cmake-modules fmt libuv boost git lua
+          pacman -Syu --noconfirm base-devel clang cmake ninja extra-cmake-modules fmt libuv git lua
       - uses: actions/checkout@v4
         with:
           repository: fcitx/fcitx5