fix: correct pandoc flag --syntax-highlighting to --highlight-style

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: taylorarndt

.github/workflows/build-epub.yml

@@ -23,8 +23,8 @@ jobs:
 
       - name: Install Pandoc
         run: |
-          curl -sL https://github.com/jgm/pandoc/releases/download/3.6.4/pandoc-3.6.4-1-amd64.deb -o pandoc.deb
-          sudo dpkg -i pandoc.deb
+          sudo apt-get update -qq
+          sudo apt-get install -y pandoc
 
       - name: Set up Node.js
         uses: actions/setup-node@v4

scripts/build-epub.js

@@ -119,7 +119,7 @@ const epubCmd = [
   '--toc',
   '--toc-depth=2',
   '--split-level=1',
-  '--syntax-highlighting=tango',
+  '--highlight-style=tango',
   '--wrap=none',
   fileArgs
 ].join(' \\\n  ');