bump `rand_core` from `0.6.4` to `0.9.2`; edition 2024; bump MSRV to 1.85 #832

Job	Run time
nightly	50s
test (1.83.0)	6m 55s
build (1.83.0, thumbv7em-none-eabi)	34s
test (stable)	6m 47s
build (1.83.0, wasm32-unknown-unknown)	28s
build (stable, thumbv7em-none-eabi)	26s
minimal-versions	32s
build (stable, wasm32-unknown-unknown)	25s
	16m 57s

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