Update Rust crate snafu to v0.8.9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
snafu	dependencies	patch	0.8.5 → 0.8.9

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Release Notes

shepmaster/snafu (snafu)

v0.8.9

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Fixed

• Allow the unstable-provider-api feature to be used in a no_std
  environment, both with and without the alloc feature flag enabled.

v0.8.8

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Fixed

• Gate TryFuture::whatever_context,
  TryFuture::with_whatever_context, TryStream::whatever_context,
  and TryStream::with_whatever_context behind the alloc feature
  flag. This allows SNAFU's future and stream combinators to be used
  in a no_std environment.

• Only implement GenerateImplicitData and AsBacktrace for Arc
  wrappers when the target platform has access to atomics and Arc.

v0.8.7

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Added

• GenerateImplicitData and AsBacktrace are now implemented for
  Box<T>, Rc<T>, and Arc<T> when T implements the same
  trait. This allows you to use types like Arc<Backtrace> as a
  backtrace field.

v0.8.6

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Added

• A new alloc feature flag has been added as a subset of the
  existing std feature flag. This allows SNAFU to be used in
  environments that have access to an allocator but not the standard
  library.

• Context selectors may now be explicitly named. This allows
  flexibility in edge cases, but also is understood by rust-analyzer
  to help with renaming context selectors.

Fixed

• Added #[allow(dead_code)] to the context selector's fail
  method. This works around an issue with the dead_code lint in rare
  usages involving declarative macros and explicit visibility
  qualifiers.

Changed

• Add top-level documentation on reporting errors using
  #[snafu::report].

• Show the cfg options that control features on docs.rs.

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