Remove EESSI version selection

Author: ocaisa

.github/workflows/tests_archdetect.yml

@@ -23,8 +23,6 @@ jobs:
       uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
     - name: Enable EESSI
       uses: eessi/github-action-eessi@58b50fd2eead2162c2b9ac258d4fb60cc9f30503 # v2.0.13
-      with:
-        eessi_stack_version: '2023.06'
     - name: test eessi_archdetect.sh
       run: |
           export EESSI_MACHINE_TYPE=${{matrix.proc_cpuinfo}}