chore(deps): update actions/setup-python action to v6

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [actions/setup-python](https://redirect.github.com/actions/setup-python) | action | major | `v5` -> `v6` | --- ### Release Notes <details> <summary>actions/setup-python (actions/setup-python)</summary> ### [`v6`](https://redirect.github.com/actions/setup-python/compare/v5...v6) [Compare Source](https://redirect.github.com/actions/setup-python/compare/v5...v6) </details> --- ### Configuration 📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM, only on Monday ( * 0-3 * * 1 ) (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/wcampbell0x2a/zerus). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS45MS4xIiwidXBkYXRlZEluVmVyIjoiNDEuOTEuMSIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6W119-->