Support Micromamba v2

[maresb]

Description

Looks like some things broke?

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[maresb]

Ok, I think the failures are covered by these two issues in micromamba:
mamba-org/mamba#3467
mamba-org/mamba#3480

[maresb]

There were two failures:

• One in the normal test suite where we used micromamba list --json to verify the dependencies of an environment. That was affected by micromamba2: base_url and channel are mangled in micromamba list --json mamba-org/mamba#3480, but as far as I can tell, this is not used by conda-lock itself, just by the verification.
• In the integration tests when micromamba tries to install pip dependencies on Windows it fails as per micromamba2 can't install pip packages in new environment mamba-org/mamba#3467. Since this is not our fault I'm ignoring it by pinning micromamba to 1.5.10.