deal with backport StrEnum doesn't work with python <3.10 and requirements.txt for backports

.github/workflows/unit_tests.yml

@@ -33,16 +33,6 @@ jobs:
           pip install pytest
           pip install -r requirements.txt
 
-      - name: Backport to 3.8
-        if: matrix.python-version == '3.8'
-        run: |
-          pip install backports.zoneinfo
-
-      - name: Backport StrEnum
-        if: matrix.python-version < '3.11'
-        run: |
-          pip install backports.strenum
-
       - name: Test with pytest
         run: |
           python -m pytest tests

eos/options.py

@@ -13,7 +13,12 @@ import logging
 try:
     from enum import StrEnum
 except ImportError:
-    from backports.strenum import StrEnum
+    try:
+        # python <3.11 try to use backports
+        from backports.strenum import StrEnum
+    except ImportError:
+        # python <3.10 use Enum instead
+        from enum import Enum as StrEnum
 
 @dataclass
 class CommandlineParameterConfig:

requirements.txt

@@ -2,3 +2,5 @@ numpy
 h5py
 orsopy
 numba
+backports.strenum; python_version<"3.11"
+backports.zoneinfo; python_version<"3.9"