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Downgrade hashbrown to meet MSRV #1733

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Commits on Sep 22, 2022

  1. Downgrade hashbrown to meet MSRV

    `hashbrown` depends on `ahash` which depends on `once_cell`. Sadly,
    in matklad/once_cell#201 the `once_cell`
    maintainer decided they didn't want to do the work of having an
    MSRV policy for `once_cell`, making `ahash`, and thus `hashbrown`
    require the latest compiler. I've reached out to `ahash` to suggest
    they drop the dependency (as they could trivially work around not
    having it), but until then we simply downgrade `hashbrown`.
    
    `rust-bitcoin` also requires an older `hashbrown` so we're actually
    reducing our total `no-std` code here anyway.
    TheBlueMatt committed Sep 22, 2022
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