Make use of Rust 1.81. #739

Job	Run time
incremental-mutants	36s
incremental-mutants	10m 11s
lint (stable)	2m 34s
lint (stable)	7m 56s
build (ubuntu, stable, locked, true)	1m 23s
build (ubuntu, stable, locked, true)	21m 24s
lint (nightly)	8m 41s
lint (nightly)	3m 21s
deny	49s
deny	46s
build (windows, stable, locked, false)	1m 10s
build (windows, stable, locked, false)	39m 42s
lint (beta)	8m 46s
lint (beta)	2m 56s
miri	1m 42s
miri	2m 4s
build (macos, stable, locked, false)	38s
build (macos, stable, locked, false)	23m 18s
build (ubuntu, nightly, locked, false)	20m 34s
build (ubuntu, nightly, locked, false)	8m 57s
no_std	11s
no_std	54s
build (ubuntu, beta, locked, false)	21m 12s
build (ubuntu, beta, locked, false)	8m 50s
build (ubuntu, stable, latest, false)	2m 38s
build (ubuntu, stable, latest, false)	22m 7s
build (ubuntu, stable, minimal, false)	2m 14s
build (ubuntu, stable, minimal, false)	22m 9s
deploy	0s
deploy	0s
fuzz	0s
fuzz	6m 54s
features	0s
features	28m 44s
	4h 43m 21s

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