fix : fix a syntax error

Author: aka411

.github/workflows/linux-build.yml

@@ -9,7 +9,7 @@ jobs:
 
       - name: Install Linux dependencies
         run: |
-        sudo apt-get update
+        sudo apt-get update \
         sudo apt-get install -y \
           build-essential cmake pkg-config \
           libx11-dev libxext-dev libxrandr-dev libxcursor-dev \