Update ahash requirement from 0.7.0 to 0.8.1

[dependabot[bot]]

Updates the requirements on ahash to permit the latest version.

Release notes

Sourced from ahash's releases.

Version 0.8.1

• Fix compiler error on wasm with default features.
• Significant improvements to speed on unusual architectures (Things other than: x86_64, aarch64, mips64, powerpc64, riscv64gc, or s390x)
• Improved documentation
• Added support for into_keys and into_values to AHashMap
• Fix AVR support by using atomic-polyfill
• Simplify the way that flags work

Commits

• 673c17c Bump version for release
• 2f39c89 Improve documentation around keys (#139)
• 2c1a088 Run smhasher test with weaker keys
• fc7b36b Add into_keys and into_values to AHashMap (#136)
• 6801bf1 Improve documentation (#135)
• 8174160 Support fixed seed (#131)
• 8eeeabc Improve fallback speed when folded multiply is not available (#134)
• e9c6735 fix AVR support by using atomic-polyfill (#124)
• b526344 Fix compiler error on wasm with deault features. (#129)
• 24491f6 Simplify interface (#121)
• Additional commits viewable in compare view

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[mockersf]

blocked on a new release of hashbrown

[dependabot[bot]]

Superseded by #6609.