fix(sns): Don't let very old upgrade proposals block future upgrades … #633

Job	Run time
Bazel System Test Hotfix	20m 55s
Bazel System Test Staging	16m 54s
Bazel System Test Nightly	33m 56s
Dependency Scan for Release	3m 52s
Setting up guest os qualification pipeline	8s
CI Main / Bazel Build All Config Check	0s
CI Main / Bazel Build Fuzzers AFL	5m 17s
CI Main / Bazel Build Fuzzers	6m 38s
CI Main / Bazel Test All	13m 48s
CI Main / Bazel Test macOS Intel	35m 11s
CI Main / Build IC	20m 31s
CI Main / Cargo Build Release Linux	22s
CI Main / Cargo Clippy Linux	22s
CI Main / Python CI Tests	2m 5s
Qualifying d69648b2f5a3d90fb515824314ac2f868cbf499a -> efc765d33686c921e3675d8e536589dd21045646	1h 28m 27s
Qualifying 9427aba69301dbaaa9b7eb48d809b01749b24d88 -> efc765d33686c921e3675d8e536589dd21045646	1h 22m 50s
CI Main / Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	39s
CI Main / Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	36s
CI Main / Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	35s
CI Main / Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	34s
CI Main / Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	51s
	5h 34m 31s

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