release: bump version to v0.18.5 #17436

Job	Run time
lint code	7m 6s
check commits	6m 6s
check pinned dependencies (google.golang.org/grpc v1.59.0)	3s
cross compilation	35m 2s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
run macOS itest	52m 10s
check release notes updated	4s
RPC and mobile compilation check	5m 5s
sample configuration check	3m 30s
Sqlc check	5m 9s
run ubuntu itests (btcd, backend=btcd cover=1)	33m 40s
run unit tests (btcd unit-cover)	15m 56s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	40m 20s
run windows itest	6m 57s
run unit tests (unit tags="kvdb_etcd")	18m 58s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 23s
run unit tests (unit tags="kvdb_postgres")	17m 31s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	41m 6s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	56m 11s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 18m 34s
run unit tests (unit tags="kvdb_sqlite")	15m 45s
run unit tests (btcd unit-race)	31m 53s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	42m 50s
run unit tests (unit-module)	3m 34s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 18m 1s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	42m 15s
run ubuntu itests (neutrino, backend=neutrino cover=1)	38m 10s
finish	3s
	11h 55m 28s

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