Update CI to run on python 3.9, 3.11 and 3.13

Author: analog-cbarber

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.8", "3.10", "3.12"]
+        python-version: ["3.9", "3.11", "3.13"]
     steps:
     - uses: actions/checkout@v3
     - uses: goanpeca/setup-miniconda@v2.2.0