tests: fix make test (#5966)

## Description
 
- bump deadlock dep to master
  - fixes `make test` since we now use `deadlock.Once`

Closes: #XXX

go.mod

@@ -10,7 +10,6 @@ require (
 	github.com/btcsuite/btcutil v1.0.2
 	github.com/confio/ics23/go v0.6.3
 	github.com/cosmos/iavl v0.15.3
-	github.com/dvyukov/go-fuzz v0.0.0-20210103155950-6a8e9d1f2415 // indirect
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/go-kit/kit v0.10.0
 	github.com/go-logfmt/logfmt v0.5.0
@@ -28,7 +27,7 @@ require (
 	github.com/prometheus/client_golang v1.9.0
 	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0
 	github.com/rs/cors v1.7.0
-	github.com/sasha-s/go-deadlock v0.2.0
+	github.com/sasha-s/go-deadlock v0.2.1-0.20190427202633-1595213edefa
 	github.com/snikch/goodman v0.0.0-20171125024755-10e37e294daa
 	github.com/spf13/cobra v1.1.1
 	github.com/spf13/viper v1.7.1