CI: always update dependencies explicitly

Fix macOS build

Author: CarterLi

.github/workflows/ci.yml

@@ -120,7 +120,9 @@ jobs:
         uses: actions/checkout@v4
 
       - name: install required packages
-        run: brew install vulkan-loader vulkan-headers molten-vk imagemagick chafa
+        run: |
+          brew update
+          brew install vulkan-loader vulkan-headers molten-vk imagemagick chafa
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2