build: Bump Rust toolchain to `nightly-2024-09-29` #11670

Job	Run time
check-features	9m 56s
check-wasm	6m 52s
integration-test (ubuntu-latest)	2m 47s
test (ubuntu-latest)	4m 56s
integration-test (windows-latest)	7m 38s
test (windows-latest)	12m 39s
	44m 48s

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