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Bump in-tree mctp-rs to dymk/mctp-rs @ 1b8b7f5 #2435

Job	Run time
ubuntu / 1.90 / thumbv8m.main-none-eabihf	1m 38s
ubuntu / stable / machete	18s
ubuntu / check-examples (examples/rt633)	17s
ubuntu / stable / deny	1m 19s
ubuntu / stable / test	3m 4s
ubuntu / check-examples (examples/rt685s-evk)	1m 19s
nightly / doc	2m 3s
ubuntu / check-examples (examples/std)	37s
stable / x86_64-unknown-linux-gnu / clippy	4m 13s
beta / thumbv8m.main-none-eabihf / clippy	4m 4s
ubuntu / check-examples (examples/pico-de-gallo)	52s
beta / x86_64-unknown-linux-gnu / clippy	4m 6s
ubuntu / 1.90 / x86_64-unknown-linux-gnu	1m 51s
stable / thumbv8m.main-none-eabihf / clippy	4m 6s
stable / fmt	26s
	30m 13s

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