ci: upgrade setup-python to v6

Author: tylerbcrawford

.github/workflows/ci.yml

@@ -6,15 +6,12 @@ on:
   pull_request:
     branches: ["**"]
 
-env:
-  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
-
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - run: pip install -r requirements-dev.txt