Update Rust crate rayon to 1.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rayon	dependencies	minor	1.7.0 -> 1.8.0

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Release Notes

rayon-rs/rayon (rayon)

v1.8.0

Compare Source

• The minimum supported rustc is now 1.63.
• Added ThreadPoolBuilder::use_current_thread to use the builder thread as
  part of the new thread pool. That thread does not run the pool's main loop,
  but it may participate in work-stealing if it yields to rayon in some way.
• Implemented FromParallelIterator<T> for Box<[T]>, Rc<[T]>, and
  Arc<[T]>, as well as FromParallelIterator<Box<str>> and
  ParallelExtend<Box<str>> for String.
• ThreadPoolBuilder::build_scoped now uses std::thread::scope.
• The default number of threads is now determined using
  std::thread::available_parallelism instead of the num_cpus crate.
• The internal logging facility has been removed, reducing bloat for all users.
• Many smaller performance tweaks and documentation updates.

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