deps: Update pixi tool constraint to >=0.70.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pixi	tool-constraint	patch	>=0.70.1 → >=0.70.2

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Release Notes

prefix-dev/pixi (pixi)

v0.70.2

Compare Source

Added

• Improve PyPI > Conda clobber detection by @​tdejager in #​6292

Changed

• Avoid pixi lock panics on unmappable ROS dependencies by @​baszalmstra in #​6290

Fixed

• Compare pypi git urls using the raw url, not uv's canonical one by @​baszalmstra in #​6272
• Keep conda-env build discriminator out of PEP 517 config_settings by @​baszalmstra in #​6273
• Accept find-links URLs during lock file satisfiability by @​baszalmstra in #​6270

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