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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-python	action	major	v5 -> v6

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Release Notes

actions/setup-python (actions/setup-python)

v6

Compare Source

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Configuration

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🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[codspeed-hq]

CodSpeed Performance Report

Merging #699 will not alter performance

_{Comparing renovate/actions-setup-python-6.x (d9447da) with main (940d423)}

Summary

✅ 38 untouched