Enable 6 second block times for `people` chain #1677

Job	Run time
Extract tasks from matrix	3s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://polkadot-try-runtime-node.par...	16m 45s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://kusama-try-runtime-node.par...	11m 53s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	9m 23s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	19m 17s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	5m 2s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	8m 43s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	5m 34s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	5m 16s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	5m 39s
	1h 27m 35s

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