run apt-get update to fix package installation failure

Author: ygj6

.github/workflows/gha.yml

@@ -94,17 +94,10 @@ jobs:
         pattern: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
     steps:
     - uses: actions/checkout@v1
-    - name: install g++-multilib
-      run: |
-        sudo apt-get install g++-multilib
-    - name: install clang
-      run: |
-        sudo apt-get update
-        sudo apt-get install clang-8
-    - name: install valgrind
+    - name: install depends
       run: |
         sudo apt-get update
-        sudo apt-get install valgrind
+        sudo apt-get install g++-multilib clang-8 valgrind
     - name: Cache boost
       id: cache-boost
       uses: actions/cache@v1