add Python 3.13 target and manual dispatching

Author: jdelic

.github/workflows/test.yml

@@ -5,14 +5,15 @@ on:
         branches: [ "master" ]
     pull_request:
         branches: [ "master" ]
+    workflow_dispatch:
 
 jobs:
     build:
         runs-on: ubuntu-latest
         strategy:
             max-parallel: 4
             matrix:
-                python-version: ["3.11", "3.12"]
+                python-version: ["3.11", "3.12", "3.13"]
 
         steps:
             - uses: actions/checkout@v4