Fix Dask tokenisation performance issues by not hashing #926

Job	Run time
sdist_verify	17s
docs / Load tox environments	14s
allowed-fail-tests / Load tox environments	15s
tests / Load tox environments	10s
tests / py312 (ubuntu-latest)	5m 4s
tests / py311 (ubuntu-latest)	4m 3s
tests / py311-online (windows-latest)	5m 36s
tests / py310 (macos-latest)	7m 47s
tests / py310-oldestdeps (ubuntu-latest)	4m 49s
docs / build_docs-notebooks (ubuntu-latest)	3m 16s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	2m 32s
publish	0s
notify	0s
	34m 3s

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