Update hashbrown requirement from 0.14 to 0.15 #225

Job	Run time
clippy_check (-C target-cpu=native, avx2, 128bit)	57s
clippy_check (-C target-cpu=native, avx2, custom-types)	56s
coverage (-C target-cpu=native, avx2, 128bit)	1m 1s
clippy_check (-C target-cpu=native, avx2, c-abi)	1m 13s
coverage (-C target-cpu=native, avx2, custom-types)	59s
clippy_check (-C target-cpu=native, avx2, hashbrown)	56s
coverage (-C target-cpu=native, avx2, c-abi)	1m 23s
clippy_check (-C target-cpu=native, avx2, halfbrown)	57s
coverage (-C target-cpu=native, avx2, hashbrown)	58s
clippy_check (-C target-cpu=native -C target-feature=-avx2, sse, 128bit)	58s
coverage (-C target-cpu=native, avx2, halfbrown)	1m 2s
clippy_check (-C target-cpu=native -C target-feature=-avx2, sse, custom-types)	57s
coverage (-C target-cpu=native -C target-feature=-avx2, sse, 128bit)	1m 0s
clippy_check (-C target-cpu=native -C target-feature=-avx2, sse, c-abi)	1m 15s
coverage (-C target-cpu=native -C target-feature=-avx2, sse, custom-types)	59s
clippy_check (-C target-cpu=native -C target-feature=-avx2, sse, hashbrown)	57s
coverage (-C target-cpu=native -C target-feature=-avx2, sse, c-abi)	1m 22s
clippy_check (-C target-cpu=native -C target-feature=-avx2, sse, halfbrown)	54s
coverage (-C target-cpu=native -C target-feature=-avx2, sse, hashbrown)	1m 0s
coverage (-C target-cpu=native -C target-feature=-avx2, sse, halfbrown)	1m 1s
	20m 45s

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