Fixed to work with Python 3.10 (#5)

Author: roytsmart

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
           windows-latest,
           macOS-latest,
         ]
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.10", "3.12"]
     name: ${{ matrix.os }}, Python ${{ matrix.python-version }} test
     steps:
       - uses: actions/checkout@v2

msfc_ccd/_images/_sensor_images.py

@@ -1,5 +1,5 @@
 from __future__ import annotations
-from typing import Self
+from typing_extensions import Self
 import dataclasses
 import pathlib
 import numpy as np

msfc_ccd/_images/_tap_images.py

@@ -1,4 +1,4 @@
-from typing import Self, ClassVar
+from typing_extensions import Self, ClassVar
 import abc
 import dataclasses
 import astropy.units as u