Upgrade Rust toolchain to `nightly-2024-02-25` #6184

Job	Run time
benchcomp-tests	3m 16s
perf	35m 21s
write-json-symtab-regression	11m 27s
bookrunner	13m 53s
regression (macos-13)	29m 9s
regression (ubuntu-20.04)	20m 33s
regression (ubuntu-22.04)	20m 50s
	2h 14m 29s

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