Bump tested versions (#211)

Author: asvetlov

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
       (github.event_name == 'pull_request_target' && github.actor == 'dependabot[bot]')
     strategy:
       matrix:
-        py_version: ['3.8', '3.9', '3.10', '3.11']
+        py_version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
     - name: Checkout commit
       uses: actions/checkout@v4