Update snafu requirement from 0.7 to 0.8

[dependabot]

Updates the requirements on snafu to permit the latest version.

Changelog

Sourced from snafu's changelog.

0.8.0 - 2023-12-28

Added

• snafu(transparent) allows creating compound error types that act as if they were not present, delegating thier Display and Error implementations to the source error. This is useful when aggregating smaller errors that already completely explain the failure.

• ResultExt::boxed and ResultExt::boxed_local are available to convert an error value into an owned trait object. This is useful when an error type is a generic controlled by the caller.

Changed

• Rust 1.56 is now the minimum supported Rust version. This is a breaking change.

• Rust 1.65 is now the default supported Rust version. This is a breaking change.

• The item type of the ChainCompat iterator is now &'a (dyn Error + 'b) to allow downcasting the error trait object to a concrete type. This is a breaking change.

• Error fields marked location are no longer automatically implicitly created. This is a breaking change.

• Adding #[snafu] attributes to the field of a tuple struct are now errors. This is a breaking change.

• The SNAFU copy of the Error trait now marks the description and cause methods as deprecated, following the standard library's example. This trait is only active when using SNAFU in a no_std environment and no functional difference is intended.

Removed

• The default Display implementation no longer includes the error text of the source error. This is a breaking change.

• The backtraces and unstable-backtraces-impl-std feature flags have been removed. This is a breaking change. The Backtrace type is now the standard library's Backtrace type when it is available.

Fixed

... (truncated)

Commits

• db76cb3 Release 0.8.0
• 509abf7 Merge pull request #428 from shepmaster/changelog
• 1dc3d95 Update the changelog and upgrading guide in preparation for 0.8
• 3fcc81a Merge pull request #432 from shepmaster/undo
• 7b8e6a8 Revert "Allow yeeting context selectors to generate errors"
• c1faaa8 Merge pull request #430 from shepmaster/our-error-deprecated
• c5fe470 Mirror std Error's deprecated methods on our Error trait
• bea7f27 Merge pull request #426 from shepmaster/std-backtrace
• ae4679e Use std::backtrace::Backtrace as the default backtrace provider
• a239d70 Merge pull request #427 from shepmaster/macro-doc-aliases
• Additional commits viewable in compare view

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