Upgrade to Rust 1.84 #5636

Job	Run time
Measure coverage	30m 41s
Basic Checks	20m 51s
Additional Builds and Concurrency Tests	18m 43s
miri	3m 1s
Release builds and tests	12m 11s
Slow tests	21m 39s
sanitize (address)	17m 37s
sanitize (address, multi-threading)	19m 39s
sanitize (leak)	7m 55s
sanitize (leak, multi-threading)	8m 32s
	2h 40m 49s

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