Update hashbrown requirement from 0.15.5 to 0.16.0 in /tests/fuzz in the fuzz-dependencies group

[dependabot]

Updates the requirements on hashbrown to permit the latest version.
Updates hashbrown to 0.15.5

Release notes

Sourced from hashbrown's releases.

v0.15.5

Added

• Added Entry::or_default_entry and Entry::or_insert_entry.

Changed

• Re-implemented likely/unlikely with #[cold]

Changelog

Sourced from hashbrown's changelog.

0.15.5 - 2025-08-07

Added

• Added Entry::or_default_entry and Entry::or_insert_entry.

Changed

• Re-implemented likely/unlikely with #[cold]

0.15.4 - 2025-06-05

Changed

• Removed optional dependency on compiler-builtins. This only affects building as part of std.

0.15.3 - 2025-04-29

Added

• SIMD implementation for LoongArch (#592, requires nightly)

Changed

• Optimized insertion path by avoiding an unnecessary match_empty (#607)
• Increased minimum table size for small types (#615)
• Dropped FnMut trait bounds from ExtractIf data structures (#616)
• Relaxed constraint in hash_map::EntryRef insertion methods K: From<&Q> to &Q: Into<K> (#611)
• Added allocator template argument for rustc_iter (#605)
• The allocator-api2/nightly feature is no longer enabled by hashbrown/nightly (#606)

[v0.15.2] - 2024-11-14

Added

• Marked const fn constructors as rustc_const_stable_indirect when built as part of the standard library. (#586)

[v0.15.1] - 2024-11-03

This release removes the borsh feature introduced in 0.15.0 because it was found to be incorrectly implemented. Users should use the hashbrown feature of the borsh crate instead which provides the same trait implementations.

[v0.15.0] - 2024-10-01

This release was yanked due to a broken implementation of the borsh feature.

This update contains breaking changes that remove the raw API with the hope of centralising on the HashTable API in the future. You can follow the discussion

... (truncated)

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