chore: release v0.16.1

[github-actions]

🤖 New release

• hashbrown: 0.16.0 -> 0.16.1 (✓ API compatible changes)

Changelog

0.16.1 - 2025-09-30

Added

• recognize and use over sized allocations

Fixed

• fixes par_extend for hashbrown's HashMap is less efficient than rayon's implementation for stdlib HashMap with par_iter over a Vec #651 -- use rayon's optimized collect_vec_list

Other

• Merge pull request feat: recognize and use over sized allocations #523 from morrisonlevi/oversized-allocations

• fix return

• address feedback from code review

• fast-path for not oversized allocations

• add with_capacity benchmark

• Merge pull request Depend on serde_core instead of serde #649 from DaniPopes/serde_core

• Depend on serde_core instead of serde

• Merge pull request Update changelog for 0.16 #645 from Amanieu/0.16-changelog

• Update changelog for 0.16

• The get_many_mut family of methods have been renamed to get_disjoint_mut
  to match the standard library. The old names are still present for now, but
  deprecated.

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This PR was generated with release-plz.

[alex]

a) very neat that this apparently auto creates releases!
b) is there a particular criteria for shipping 0.16.1?