Bump once_cell from 1.13.1 to 1.15.0

[dependabot[bot]]

Bumps once_cell from 1.13.1 to 1.15.0.

Changelog

Sourced from once_cell's changelog.

1.15.0

• Increase minimal supported Rust version to 1.56.0.
• Implement UnwindSafe even if the std feature is disabled.

1.14.0

• Add extension to unsync and sync Lazy mut API:
  • force_mut
  • get_mut

Commits

• 97edd07 Merge #200
• f5264bb release 1.15.0
• a0aeb9b Merge #199
• 1d8a90d fix token name
• 5ca60af Merge #198
• 99c67b7 1.15.0
• b68bee9 edition 2021
• 8e47e43 always implement unwind safe
• 8ec240e MSRV is 1.56
• 2487d34 Merge #197
• Additional commits viewable in compare view

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