cargo: Update Rust crate hashbrown to 0.16.0

This MR contains the following updates:

Package	Type	Update	Change
hashbrown	dependencies	minor	0.15.3 -> 0.16.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

rust-lang/hashbrown (hashbrown)

v0.16.0

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Changed

• Bump foldhash, the default hasher, to 0.2.0.
• Replaced DefaultHashBuilder with a newtype wrapper around foldhash instead of re-exporting it directly.

v0.15.5

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Added

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

Changed

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

v0.15.4

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Changed

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

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