Update itertools requirement from 0.8 to 0.9

[dependabot-preview[bot]]

Updates the requirements on itertools to permit the latest version.

Changelog

Sourced from itertools's changelog.

0.9.0

• Fix potential overflow in MergeJoinBy::size_hint (#385)
• Add derive(Clone) where possible (#382)
• Add try_collect method (#394)
• Add HomogeneousTuple trait (#389)
• Fix combinations(0) and combinations_with_replacement(0) (#383)
• Don't require ParitalEq to the Item of DedupBy (#397)
• Implement missing specializations on the PutBack adaptor and on the MergeJoinBy iterator (#372)
• Add position_* methods (#412)
• Derive Hash for EitherOrBoth (#417)
• Increase minimum supported Rust version to 1.32.0

0.8.2

• Use slice::iter instead of into_iter to avoid future breakage (#378, by @LukasKalbertodt)

0.8.1

• Added a .exactly_one() iterator method that, on success, extracts the single value of an iterator ; by @Xaeroxe
• Added combinatory iterator adaptors:

  • .permutations(k):

    [0, 1, 2].iter().permutations(2) yields

    [
      vec![0, 1],
      vec![0, 2],
      vec![1, 0],
      vec![1, 2],
      vec![2, 0],
      vec![2, 1],
    ]
    

    ; by @tobz1000

  • .combinations_with_replacement(k):

    [0, 1, 2].iter().combinations_with_replacement(2) yields

    [
      vec![0, 0],
      vec![0, 1],
      vec![0, 2],
      vec![1, 1],
      vec![1, 2],
      vec![2, 2],
    ]
    

    ; by @tommilligan

... (truncated)

Commits

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[dependabot-preview[bot]]

Looks like itertools is up-to-date now, so this is no longer needed.