Bump crossbeam-channel from 0.5.14 to 0.5.15

[dependabot[bot]]

Bumps crossbeam-channel from 0.5.14 to 0.5.15.

Release notes

Sourced from crossbeam-channel's releases.

crossbeam-channel 0.5.15

• Fix regression introduced in 0.5.12 that can lead to a double free when dropping unbounded channel. (#1187)

Commits

• d35ffde Prepare for the next release
• 6ec74ec crossbeam-channel: prevent double free on Drop (#1187)
• See full diff in compare view

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