Increase timeout for breakdown_reveal_mpc_proptest #573

Job	Run time
miri	2m 59s
Measure coverage	28m 18s
Additional Builds and Concurrency Tests	15m 16s
Basic Checks	20m 9s
Release builds and tests	8m 56s
Slow tests	18m 21s
sanitize (address)	17m 38s
sanitize (address, multi-threading)	19m 14s
sanitize (leak)	8m 59s
sanitize (leak, multi-threading)	8m 27s
	2h 28m 17s

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