fix: remove brew install wkhtmltopdf from macOS CI

wkhtmltopdf has been removed from Homebrew. The static arm64 dylib is now bundled in the runtimes directory, so no separate installation is needed on macOS.

Author: hueifeng

.github/workflows/dotnetcore.yml

@@ -31,10 +31,6 @@ jobs:
         if: runner.os == 'Linux'
         run: sudo apt-get update && sudo apt-get install -y libgdiplus libc6-dev libjpeg62 wkhtmltopdf fontconfig libxrender1 xfonts-75dpi
 
-      - name: Install macOS dependencies
-        if: runner.os == 'macOS'
-        run: brew install wkhtmltopdf
-
       - name: Restore
         run: dotnet restore Magicodes.IE.sln