github: update goveralls tool #16904

Job	Run time
Sqlc check	3m 44s
cross compilation	30m 53s
check commits	48s
lint code	11m 37s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
RPC and mobile compilation check	6m 32s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	5s
sample configuration check	4m 59s
run unit tests (btcd unit-cover)	19m 34s
run macOS itest	0s
run unit tests (unit tags="kvdb_etcd")	21m 25s
check release notes updated	5s
run unit tests (unit tags="kvdb_postgres")	19m 55s
run unit tests (unit tags="kvdb_sqlite")	18m 8s
run ubuntu itests	0s
run windows itest	0s
run unit tests (btcd unit-race)	40m 17s
run unit tests (unit-module)	1m 27s
finish	9s
	2h 59m 44s

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