Merge pull request #39 from palfrey/lockdown-ubuntu-version

Update Python versions to 3.9-3.13

Author: koiuo

.github/workflows/ci.yml

@@ -8,10 +8,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
 
     steps:
       - uses: actions/checkout@v3