fix(sns): Don't let very old upgrade proposals block future upgrades … #637

Job	Run time
Bazel System Test Nightly	21m 11s
Bazel System Test Hotfix	8m 35s
Bazel System Test Staging	7m 7s
Dependency Scan for Release	3m 32s
Setting up guest os qualification pipeline	8s
CI Main / Bazel Test All	19m 15s
CI Main / Bazel Build All Config Check	0s
CI Main / Bazel Build Fuzzers	3m 44s
CI Main / Bazel Build Fuzzers AFL	5m 20s
CI Main / Bazel Test macOS Intel	46m 49s
CI Main / Build IC	16m 25s
CI Main / Python CI Tests	1m 54s
CI Main / Cargo Build Release Linux	25s
CI Main / Cargo Clippy Linux	23s
Qualifying d69648b2f5a3d90fb515824314ac2f868cbf499a -> efc765d33686c921e3675d8e536589dd21045646	1h 24m 21s
Qualifying 9427aba69301dbaaa9b7eb48d809b01749b24d88 -> efc765d33686c921e3675d8e536589dd21045646	1h 28m 0s
CI Main / Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	40s
CI Main / Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	44s
CI Main / Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	47s
CI Main / Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	35s
CI Main / Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	33s
	5h 10m 28s

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