fix(sns): Don't let very old upgrade proposals block future upgrades … #636

Job	Run time
Bazel System Test Staging	10m 8s
Bazel System Test Nightly	22m 7s
Bazel System Test Hotfix	7m 44s
Dependency Scan for Release	3m 17s
Setting up guest os qualification pipeline	9s
CI Main / Bazel Test All	18m 6s
CI Main / Bazel Build All Config Check	0s
CI Main / Bazel Build Fuzzers	3m 24s
CI Main / Bazel Test macOS Intel	1h 0m 19s
CI Main / Bazel Build Fuzzers AFL	10m 37s
CI Main / Build IC	16m 42s
CI Main / Cargo Build Release Linux	27s
CI Main / Cargo Clippy Linux	25s
CI Main / Python CI Tests	2m 27s
Qualifying 9427aba69301dbaaa9b7eb48d809b01749b24d88 -> efc765d33686c921e3675d8e536589dd21045646	1h 27m 57s
Qualifying d69648b2f5a3d90fb515824314ac2f868cbf499a -> efc765d33686c921e3675d8e536589dd21045646	1h 24m 11s
CI Main / Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	35s
CI Main / Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	35s
CI Main / Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	44s
CI Main / Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	1m 8s
CI Main / Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	37s
	5h 31m 39s

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