Update Rust crate spin to 0.9.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
spin	dependencies	patch	0.9 -> 0.9.8

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Release Notes

mvdnes/spin-rs (spin)

v0.9.8

Fixed

• Unsoundness in Once::try_call_once caused by an Err(_) result

v0.9.7

Fixed

• Relaxed accidentally restricted Send/Sync bounds for Mutex guards

v0.9.6

Fixed

• Relaxed accidentally restricted Send/Sync bounds for RwLock guards

v0.9.5

Added

• FairMutex, a new mutex implementation that reduces writer starvation.
• A MSRV policy: Rust 1.38 is currently required

Changed

• The crate's CI now has full MIRI integration, further improving the confidence you can have in the implementation.

Fixed

• Ensured that the crate's abstractions comply with stacked borrows rules.
• Unsoundness in the RwLock that could be triggered via a reader overflow
• Relaxed various Send/Sync bound requirements to make the crate more flexible

v0.9.4

Fixed

• Fixed unsoundness in RwLock on reader overflow
• Relaxed Send/Sync bounds for SpinMutex and TicketMutex (doesn't affect Mutex itself)

v0.9.3

Added

• Implemented Default for Once
• Once::try_call_once

Fixed

• Fixed bug that caused Once::call_once to incorrectly fail

v0.9.2

Changed

• Improved Once performance by reducing the memory footprint of internal state to one byte

Fixed

• Improved performance of Once by relaxing ordering guarantees and removing redundant checks

v0.9.1

Added

• Default type parameter on Once for better ergonomics

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