Fix CI: bump pixi to v0.66.0 to support [workspace] manifest and lock file v6

[Copilot]

The CI workflow was pinned to pixi v0.25.0, which predates the [workspace] manifest key (introduced in v0.29.0) and lock file version 6 — causing an immediate parse failure before any tests could run.

Changes

• .github/workflows/tests.yml
  • prefix-dev/setup-pixi: v0.8.1 → v0.9.4
  • pixi-version: v0.25.0 → v0.66.0

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:

• https://api.github.com/repos/prefix-dev/pixi/releases
  • 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 (http 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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Summary by Sourcery

CI:

• Bump the prefix-dev/setup-pixi GitHub Action and Pixi version in the tests workflow to v0.9.4 and v0.66.0, respectively, so CI can parse the current project configuration.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the CI test workflow to use a newer pixi setup action and pixi version compatible with workspace manifests and lock file v6 so tests can run instead of failing during environment setup.

File-Level Changes

Change	Details	Files
Update CI workflow to use newer pixi setup action and pixi version that support workspace manifests and lock file v6.	Bump prefix-dev/setup-pixi GitHub Action from v0.8.1 to v0.9.4 in the tests workflow. Bump pixi-version used in CI from v0.25.0 to v0.66.0 so it understands the [workspace] manifest key and lock file version 6.	.github/workflows/tests.yml

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