Update Rust crate `hashbrown` to v0.15.1 #11800

Job	Run time
setup	21s
Build (@apps/hash-ai-worker-ts)	13m 23s
Build (@apps/hash-api)	11m 12s
Build (@apps/hash-graph)	8m 8s
Unit (@apps/hash-ai-worker-ts)	1m 53s
Unit (@apps/hash-api)	3m 5s
Build (@apps/hash-integration-worker)	11m 5s
Unit (@blockprotocol/type-system)	1m 37s
Unit (@blockprotocol/type-system-rs)	2m 2s
Unit (@local/hash-backend-utils)	1m 33s
Integration (@rust/authorization)	2m 25s
Unit (@local/hash-graph-sdk)	2m 7s
Integration (@rust/graph-benches)	7m 56s
Unit (@local/hash-isomorphic-utils)	2m 25s
Integration (@rust/graph-http-tests)	6m 8s
Unit (@local/hash-subgraph)	2m 6s
Integration (@rust/graph-integration)	6m 45s
Unit (@rust/antsi)	1m 1s
Integration (@tests/hash-backend-integration)	11m 25s
Unit (@rust/chonky)	55s
Integration (@tests/hash-backend-load)	8m 33s
Unit (@rust/deer)	3m 37s
Integration (@tests/hash-playwright)	13m 45s
Unit (@rust/error-stack)	2m 47s
Publish	0s
Unit (@rust/graph)	3m 39s
Unit (@rust/graph-api)	3m 22s
Unit (@rust/graph-types)	1m 37s
Unit (@rust/harpc-net)	1m 57s
Unit (@rust/harpc-types)	1m 8s
Unit (@rust/harpc-wire-protocol)	1m 58s
Unit (@rust/hql-cst)	1m 5s
Unit (@rust/hql-diagnostics)	1m 8s
Unit (@rust/hql-span)	1m 9s
Unit (@rust/hql-syntax-jexpr)	1m 17s
Unit (@rust/query-builder-derive)	59s
Unit (@rust/sarif)	1m 18s
Unit (@rust/temporal-versioning)	1m 28s
Unit (@rust/validation)	1m 39s
Tests passed	7s
	2h 30m 5s

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