remove cpp check on 16.04 (#42616)

.github/workflows/code_layout.yml

@@ -191,19 +191,6 @@ jobs:
       - name: Sip Files Up To Date
         run: ./tests/code_layout/test_sipfiles.sh
 
-  cppcheck_16_04:
-    runs-on: ubuntu-16.04
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Install Requirements
-        run: |
-          sudo apt install -y cppcheck
-
-      - name: Run cppcheck test
-        run: ./scripts/cppcheck.sh
-
   cppcheck_18_04:
     runs-on: ubuntu-18.04
     steps: