chore: update for Python 3.13 (#25)

Author: bdraco

.github/workflows/ci.yml

@@ -36,11 +36,11 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - "3.8"
           - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
+          - "3.13"
         os:
           - ubuntu-latest
           - windows-latest