fix(nervous-system): release runscript doesn't prompt you to update mainnet-canisters.json #25867

Job	Run time
Bazel Build All Config Check	0s
Bazel Build Fuzzers	1m 23s
Bazel Build Fuzzers AFL	1m 24s
Bazel Test All	2m 20s
Bazel Test macOS Intel	0s
Build IC	1m 4s
Cargo Build Release Linux	9m 43s
Python CI Tests	1m 39s
Cargo Clippy Linux	3m 29s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	16s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	13s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	12s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	18s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	15s
	22m 16s

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