Add support for hashbrown v0.15 #2125

Job	Run time
Rustfmt (stable)	9s
clippy_check (ubuntu-latest, stable)	25s
Build and Test (ubuntu-latest, 1.67)	2m 11s
clippy_check (ubuntu-latest, nightly)	33s
Build and Test (ubuntu-latest, 1.70)	2m 10s
clippy_check (windows-latest, stable)	1m 47s
Build and Test (ubuntu-latest, 1.75)	1m 48s
clippy_check (windows-latest, nightly)	1m 12s
Build and Test (ubuntu-latest, 1.80)	1m 45s
Build and Test (ubuntu-latest, stable)	4m 19s
Build and Test (ubuntu-latest, beta)	1m 42s
Build and Test (ubuntu-latest, nightly)	1m 24s
Build and Test (windows-latest, 1.67)	3m 4s
Build and Test (windows-latest, 1.70)	3m 13s
Build and Test (windows-latest, 1.75)	3m 11s
Build and Test (windows-latest, 1.80)	3m 7s
Build and Test (windows-latest, stable)	3m 13s
Build and Test (windows-latest, beta)	2m 58s
Build and Test (windows-latest, nightly)	2m 57s
Tests result	1s
	41m 9s

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