deps: Update pixi tool constraint to >=0.68.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
pixi	tool-constraint	minor	>=0.67.2 → >=0.68.0	0.69.0 (+1)

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Release Notes

prefix-dev/pixi (pixi)

v0.68.0

Compare Source

Added

• Report size of removed files by @​baszalmstra in #​6053

Fixed

• V0.68.0 pixi-aarch64-pc-windows-msvc.zip contains an x86_64 binary by @​baszalmstra in #​6064
• Normalize self-ref extras on both sides of compare by @​baszalmstra in #​6052
• Satisfy lock-file when feature-level index-url is set by @​baszalmstra in #​6065
• Evaluate PyPI extras when walking lockfile dependencies by @​baszalmstra in #​6068
• To alias on target_channel by @​ruben-arts in #​6070
• Fallback behaviour added to atomic writes by @​suleman1412 in #​5748
• Serialize PEP 508 deps as filesystem paths by @​aldbr in #​6072

New Contributors

• @​aldbr made their first contribution in #​6072
• @​sstadick made their first contribution in #​6055

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