Fix continuous.yml

Author: yib0liu

.github/workflows/continuous.yml

@@ -36,8 +36,8 @@ jobs:
       - name: Dependencies (Linux)
         if: runner.os == 'Linux'
         run: |
-          sudo apt update
-          sudo apt -o Acquire::Retries=3 install \
+          sudo apt-get update
+          sudo apt-get -o Acquire::Retries=3 install \
           libblas-dev \
           libglu1-mesa-dev \
           xorg-dev \