Don't install package that comes with bats-core

It didn't use to come with it but now it does

Author: simeg

.github/workflows/ci.yaml

@@ -10,9 +10,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Install parallel  # Used in CI Bash
-      run: sudo apt-get install parallel
-
     - name: CI Bash
       run: make ci-bash