Bump setup-python v5 -> v6 (#87)

* Cleans away min python version

Inline with scientific python specs

* Bump setup-python v5 -> v6

Author: CyclingNinja

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

@@ -37,7 +37,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"