ci: unpin pixi

[cpcloud]

Update pixi lockfile to 0.60.0 version and unpin pixi in CI

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[greptile-apps]

Greptile Overview

Greptile Summary

Unpinned pixi version in CI workflows and updated pixi.lock to 0.60.0 format, resolving the lockfile compatibility issue.

• Removed pixi-version: "v0.59.0" pin from all three workflow files (conda-python-tests, docs-build, simulator-test)
• Updated pixi.lock to version 6 format with new pypi-prerelease-mode: if-necessary-or-explicit option for all environments
• Bumped ml_dtypes dependency from 0.5.3 to 0.5.4 across all Python versions and architectures

Confidence Score: 5/5

• Safe to merge - reverts temporary workaround and properly updates lockfile
• This PR cleanly reverses a temporary pin that was added to work around a lockfile compatibility issue, and updates the lockfile to the new pixi 0.60.0 format. The changes are straightforward: removing version pins from CI workflows and updating the lockfile with the new format and minor dependency updates
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
.github/workflows/conda-python-tests.yaml	5/5	Removed pixi-version: "v0.59.0" pin, allowing setup-pixi action to use latest compatible version
.github/workflows/docs-build.yaml	5/5	Removed pixi-version: "v0.59.0" pin, allowing setup-pixi action to use latest compatible version
.github/workflows/simulator-test.yaml	5/5	Removed pixi-version: "v0.59.0" pin, allowing setup-pixi action to use latest compatible version
pixi.lock	5/5	Updated to pixi 0.60.0 format with new pypi-prerelease-mode option and ml_dtypes bumped from 0.5.3 to 0.5.4

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub Actions
    participant Pixi as setup-pixi Action
    participant Lock as pixi.lock

    Note over Dev,Lock: Previous State (PR #632)
    Dev->>GH: Pinned pixi to v0.59.0
    Note over GH: pixi.lock incompatible with v0.60.0
    
    Note over Dev,Lock: Current PR #633
    Dev->>Lock: Update to pixi 0.60.0 format
    Note over Lock: Add pypi-prerelease-mode option<br/>Bump ml_dtypes 0.5.3 → 0.5.4
    Dev->>GH: Remove pixi-version pin
    
    Note over Dev,Lock: CI Workflow Execution
    GH->>Pixi: Setup pixi (no version specified)
    Pixi->>Pixi: Use latest compatible version (0.60.0+)
    Pixi->>Lock: Read pixi.lock
    Lock-->>Pixi: Version 6 format with new options
    Pixi->>GH: Environment configured successfully

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[greptile-apps]

_{3 files reviewed, no comments}

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[cpcloud]

/ok to test