bump `rand_core` from `0.6.4` to `0.9.2`; edition 2024; bump MSRV to 1.85 #837

Job	Run time
nightly	51s
build (1.83.0, thumbv7em-none-eabi)	38s
minimal-versions	1m 4s
build (1.83.0, wasm32-unknown-unknown)	29s
build (stable, thumbv7em-none-eabi)	35s
test (1.83.0)	6m 40s
build (stable, wasm32-unknown-unknown)	28s
test (stable)	6m 35s
	17m 20s

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