Update Python version support (#178)

* Add Python 3.11 to workflows for testing

* Fix invalid syntax for Python version matrix

* Add Python 3.10 to version matrix

* Add Python 3.9 to version matrix

* Add Python 3.8 to version matrix

* Remove Python 3.8 from version matrix

PittAPI is currently incompatible with Python 3.8 because alabaster
package requires >= 3.9

* Update Python version string in GitHub Actions workflows

* Add `from __future__ import annotations`

Add the import `from __future__ import annotations` to Python files that
use the pipe operator (`A | B` instead of `Union[A, B]`) in order to
maintain compatibility with Python 3.9

.github/workflows/autotest.yml

@@ -9,13 +9,16 @@ on:
 jobs:
   run-test-suite:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Python 3.12
+      - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v3
         with:
-          python-version: "3.12"
+          python-version: ${{ matrix.python }}
       # https://github.com/actions/cache/blob/main/examples.md#python---pip
       - uses: actions/cache@v4
         with:

.github/workflows/tests-on-push.yml

@@ -12,13 +12,16 @@ permissions:
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.12
+    - name: Set up Python ${{ matrix.python }}
       uses: actions/setup-python@v3
       with:
-        python-version: "3.12"
+        python-version: ${{ matrix.python }}
     # https://github.com/actions/cache/blob/main/examples.md#python---pip
     - uses: actions/cache@v4
       with:

pittapi/course.py

@@ -17,6 +17,8 @@
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 """
 
+from __future__ import annotations
+
 import re
 import requests
 from typing import NamedTuple

pittapi/laundry.py

@@ -17,6 +17,8 @@
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 """
 
+from __future__ import annotations
+
 import requests
 from typing import Any