Update performance test dependencies (#984)

Author: dhurley

test/performance/go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/nats-io/nats-server/v2 v2.10.4
 	github.com/nats-io/nats.go v1.31.0
 	github.com/nginx/agent/sdk/v2 v2.0.0-00010101000000-000000000000
-	github.com/nginx/agent/v2 v2.30.3
+	github.com/nginx/agent/v2 v2.0.0-00010101000000-000000000000
 	github.com/prometheus/client_golang v1.19.1
 	github.com/sanity-io/litter v1.5.5
 	github.com/sirupsen/logrus v1.9.3

test/performance/vendor/modules.txt

@@ -140,7 +140,7 @@ github.com/nginx/agent/sdk/v2/proto
 github.com/nginx/agent/sdk/v2/proto/common
 github.com/nginx/agent/sdk/v2/proto/events
 github.com/nginx/agent/sdk/v2/zip
-# github.com/nginx/agent/v2 v2.30.3 => ./../../
+# github.com/nginx/agent/v2 v2.0.0-00010101000000-000000000000 => ./../../
 ## explicit; go 1.23
 github.com/nginx/agent/v2/src/core
 github.com/nginx/agent/v2/src/core/config