Bump futures-core from 0.3.21 to 0.3.29 #32

Job	Run time
android-runner	31m 9s
cargo-crev-verify	13m 28s
xtask (check-format)	12m 0s
xtask (run-cargo-deny)	9m 40s
xtask (run-cargo-udeps)	24m 15s
xtask (build-oak-functions-server-variants)	25m 55s
xtask (run-cargo-tests)	21m 24s
xtask (run-oak-functions-examples --application-variant=rust)	49m 47s
xtask (run-cargo-fuzz --build-deps -- -max_total_time=2)	22m 10s
xtask (completion)	11m 14s
xtask (run-cargo-clippy)	27m 38s
	4h 8m 40s

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