Update spin requirement from 0.5 to 0.8 in /wee_alloc

[dependabot-preview]

Updates the requirements on spin to permit the latest version.

Changelog

Sourced from spin's changelog.

[0.8.0] - 2021-03-15

Added

• Once::get_unchecked
• RelaxStrategy trait with type parameter on all locks to support switching between relax strategies.

Changed

• lock_api1 feature is now named lock_api

[0.7.1] - 2021-01-12

Fixed

• Prevented Once leaking the inner value upon drop

[0.7.0] - 2020-10-18

Added

• Once::initialized
• Once::get_mut
• Once::try_into_inner
• Once::poll
• RwLock, Mutex and Once now implement From<T>
• Lazy type for lazy initialization
• TicketMutex, an alternative mutex implementation
• std feature flag to enable thread yielding instead of spinning
• Mutex::is_locked/SpinMutex::is_locked/TicketMutex::is_locked
• Barrier

Changed

• Once::wait now spins even if initialization has not yet started
• Guard::leak is now an associated function instead of a method
• Improved the performance of SpinMutex by relaxing unnecessarily conservative ordering requirements

[0.6.0] - 2020-10-08

Added

• More dynamic Send/Sync bounds for lock guards
• lock_api compatibility
• Guard::leak methods
• RwLock::reader_count and RwLock::writer_count
• Display implementation for guard types

Changed

... (truncated)

Commits

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[dependabot-preview]

Superseded by #97.