chore: bump rust to 1.84 (#3469) #661

Job	Run time
Bazel System Test Nightly	36m 14s
Bazel System Test Staging	18m 27s
Bazel System Test Hotfix	25m 6s
Dependency Scan for Release	5m 23s
Setting up guest os qualification pipeline	1m 28s
CI Main / Bazel Test All	27m 13s
CI Main / Bazel Build All Config Check	0s
CI Main / Bazel Build Fuzzers	4m 19s
CI Main / Bazel Build Fuzzers AFL	5m 11s
CI Main / Bazel Test macOS Intel	1h 14m 59s
CI Main / Build IC	17m 47s
CI Main / Python CI Tests	2m 2s
CI Main / Cargo Build Release Linux	1m 32s
CI Main / Cargo Clippy Linux	26s
Qualifying 233c1ee2ef68c1c8800b8151b2b9f38e17b8440a -> fc2787097c765498ca80e9497c3931ada0ec8bd4	1h 33m 25s
CI Main / Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	32s
CI Main / Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	32s
CI Main / Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	46s
CI Main / Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	32s
CI Main / Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	39s
	5h 16m 33s

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