This makes me all kind of uncomfortable since cytoolz is a separate pacakge and us using it this way is totally backwards. We should rely on it instead directly or remove our footprint using it. Probably larger than this PR though, so worth opening a ticket to look into it.

Originally posted by @jezdez in #11290 (comment)

Tasks

• Do we need cytoolz/toolz anymore?
• If we need cytoolz/toolz, stop vendoring and make it a dependency
  • @kenodegard None of the third-party uses we have identified need cytoolz/toolz, replace with stdlib itertools or list-/dict-comprehension or arg unpacking
  • @kenodegard Conda itself will make cytoolz a dependency
    • update default::conda feedstock
    • update conda-forge::conda feedstock
• Deprecate libmamba-draft conda-libmamba-solver#45
• Remove usage of conda._vendor.toolz and add dependency cytoolz instead constructor#523