deps: Update pixi tool constraint to >=0.79.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
pixi	tool-constraint	minor	>=0.78.0 → >=0.79.0	0.81.0 (+1)

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Release Notes

prefix-dev/pixi (pixi)

v0.79.0

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✨ Highlights

Pixi now has better support for RISC-V by setting the default virtual packages.

And we've extended the CLI to include pixi install --script and pixi workspace dependencies add.

Added

• Add pixi workspace dependencies CLI by @​ruben-arts in #​6917
• Install script environments without running by @​manzt in #​6923
• Set __glibc default to 2.39 on linux-riscv64 by @​pavelzw in #​6914

Changed

• Restore static MSVC CRT in Windows builds by @​baszalmstra in #​6919

Documentation

• Mention named platforms in pixi-pack by @​pavelzw in #​6927

Fixed

• Bump astral_async_http_range_reader to 0.11.1 by @​baszalmstra in #​6941

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