deps: Update pixi tool constraint to >=0.81.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pixi	tool-constraint	minor	>=0.80.0 → >=0.81.0

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Release Notes

prefix-dev/pixi (pixi)

v0.81.0

Compare Source

✨ Highlights

pixi run --script can now run conda-script files directly from HTTP or HTTPS URLs, including GitHub Gists. Pixi downloads the script, reuses its cached environment, and runs it without requiring a local file.

Added

• Add remote url support to conda-script by @​ruben-arts in #​6981
• Add PrefixPlatformMismatchError for source build prefixes by @​hunger in #​6984
• Show the build platform of nested derived environments by @​hunger in #​6987

Changed

• Track the platform of a derived environment explicitly by @​hunger in #​6985
• Keep nested derived environments on the build platform by @​hunger in #​6986

Documentation

• Explain how source build-dependencies are built when cross-compiling by @​hunger in #​6988

Fixed

• Use only tombi for TOML formatting by @​Hofer-Julian in #​6982

Refactor

• Return CLI exit codes from main by @​baszalmstra in #​6975

New Contributors

• @​prefix-dev-pixi-upgrades[bot] made their first contribution in #​6980

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