Update test server to version 1.4.0 (temporalio#1994)

Author: Quinn-With-Two-Ns

internal/cmd/build/main.go

@@ -112,9 +112,6 @@ func (b *builder) integrationTest() error {
 	// Start dev server if wanted
 	if *devServerFlag {
 		devServer, err := testsuite.StartDevServer(context.Background(), testsuite.DevServerOptions{
-			CachedDownload: testsuite.CachedDownload{
-				Version: "v1.3.1-nexus-links.0",
-			},
 			ClientOptions: &client.Options{
 				HostPort:  "127.0.0.1:7233",
 				Namespace: "integration-test-namespace",