chore: refer to correct contract mod

Signed-off-by: Jiyong Huang <huangjy@emqx.io>

go.mod

@@ -23,7 +23,7 @@ require (
 	github.com/keepeye/logrus-filename v0.0.0-20190711075016-ce01a4391dd1
 	github.com/klauspost/compress v1.17.7
 	github.com/lestrrat-go/file-rotatelogs v2.4.0+incompatible
-	github.com/lf-edge/ekuiper/contract/v2 v2.0.0
+	github.com/lf-edge/ekuiper/contract/v2 v2.0.0-dev.2
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/modern-go/reflect2 v1.0.2
 	github.com/montanaflynn/stats v0.7.1
@@ -121,6 +121,4 @@ require (
 	modernc.org/token v1.1.0 // indirect
 )
 
-replace github.com/lf-edge/ekuiper/contract/v2 v2.0.0 => ./contract
-
 go 1.22.1