Switch clippy from +nightly to $RUST_STABLE_VERSION (#489) #16

Job	Run time
Extract tasks from matrix	5s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://try-runtime.polkadot.io:443, ...	43m 28s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://try-runtime-kusama.polkadot...	31m 14s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	26m 20s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	38m 21s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	24m 19s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	26m 26s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	24m 11s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	24m 37s
check-migrations (coretime-polkadot, coretime-polkadot-runtime, system-parachains/coretime/coreti...	22m 45s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	23m 27s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	23m 7s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	23m 32s
All migrations passed	1s
	5h 31m 53s

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