Fix pre-commit failures from ruff v0.15.4 upgrade

[Copilot]

Ruff v0.15.4 (from #257) introduces new lint rules that fail on existing code.

• UP047 in pyproject.toml: Added to ignore list. This rule requires PEP 695 type parameter syntax (def foo[T: (...)]), which needs Python 3.12+. Project supports 3.11+.
• PLW0108 in tests/test_gp.py: Replaced mean=lambda x: jnp.sum(x) with mean=jnp.sum.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• results.pre-commit.ci
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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