Drop py37, py38, py39; add py313, py314

Bump library versions too.

Author: jamesoff

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", 3.11, 3.12]
+        python-version: ["3.10", 3.11, 3.12, 3.13, 3.14]
 
     steps:
     - uses: actions/checkout@v4.1.1