Update manager.yaml

Author: AAriam

.github/workflows/manager.yaml

@@ -89,8 +89,6 @@ jobs:
           repo_path: ${{ env.PATH_REPO_HEAD }}
           load_cache: 'true'
           activate_env: pypackit
-      - name: PyPackIT Setup
-        run: pip install ${{ env.PATH_REPO_HEAD }}/.manager --no-deps
       - name: ProMan
         id: proman
         env: