Description

Unable to schedule pathways workload with XPK==0.6.0: https://paste.googleplex.com/6583669159493632

This Pr updates runner requirements to install XPK>=1.8.0

Tests

uv pip install -e .[runner] --resolution=lowest
xpk workload create-pathways ....

Checklist

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• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.