Remove py3.9 (aiohttp failure)

Author: cokelaer

.github/workflows/apptainer.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python: [3.8, 3.9, '3.10']
+        python: [3.8, '3.10']
       fail-fast: false