Updates from OpenAstronomy/packaging-guide (#220)

This is an autogenerated PR, which merges commits from
OpenAstronomy/packaging-guide.



*Do not squash merge this PR! All commits from upstream should be
present in the repos history.*

Author: Cadair

{{ cookiecutter.package_name }}/.github/workflows/sub_package_update.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"