Update deploy.yml

Author: ShixiangWang

.github/workflows/deploy.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Install system dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y libfreetype6-dev libpng-dev libpng12-dev zlib1g-dev
+          sudo apt-get install -y libfreetype6-dev libpng-dev zlib1g-dev
 
       - name: Install R dependencies
         run: |