Upgrade Rust toolchain to `nightly-2024-02-25` #6171

Job	Run time
benchcomp-tests	3m 29s
perf	35m 6s
bookrunner	14m 50s
regression (macos-13)	25m 21s
write-json-symtab-regression	17m 31s
regression (ubuntu-20.04)	21m 45s
regression (ubuntu-22.04)	30m 5s
	2h 28m 7s

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