remove python 3.9

.github/workflows/push-pull.yml

@@ -12,7 +12,8 @@ jobs:
     uses: pyiron/actions/.github/workflows/[email protected]
     secrets: inherit
     with:
+      python-version-alt3: 'exclude'  # No python 3.9
       docs-env-files: .ci_support/environment.yml .ci_support/environment-docs.yml
       notebooks-env-files: .ci_support/environment.yml .ci_support/environment-pyiron_atomistics.yml .ci_support/environment-lammps.yml
       tests-env-files: .ci_support/environment.yml .ci_support/environment-pyiron_atomistics.yml
-      alternate-tests-env-files: .ci_support/lower_bound.yml
+      alternate-tests-env-files: .ci_support/lower_bound.yml