fix contrib gen

Author: e-n-0

contrib/haproxy/stream-processing-offload/go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/jellydator/ttlcache/v3 v3.4.0
 	github.com/negasus/haproxy-spoe-go v1.0.6
 	github.com/stretchr/testify v1.10.0
+	golang.org/x/sync v0.15.0
 )
 
 require (
@@ -80,7 +81,6 @@ require (
 	golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0 // indirect
 	golang.org/x/mod v0.25.0 // indirect
 	golang.org/x/net v0.40.0 // indirect
-	golang.org/x/sync v0.15.0 // indirect
 	golang.org/x/sys v0.33.0 // indirect
 	golang.org/x/text v0.26.0 // indirect
 	golang.org/x/time v0.11.0 // indirect