fix: disable psiphon when building with go1.19 (#871)

Part of https://github.com/ooni/probe/issues/2211.

See also https://github.com/ooni/probe/issues/2222, which
describes the issue we have with psiphon and go1.19.

internal/engine/experiment/urlgetter/getter_integration_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -275,6 +276,9 @@ func TestGetterWithCancelledContextNoFollowRedirects(t *testing.T) {
 }
 
 func TestGetterWithCancelledContextCannotStartTunnel(t *testing.T) {
+	if strings.HasPrefix(runtime.Version(), "go1.19") {
+		t.Skip("TODO(https://github.com/ooni/probe/issues/2222)")
+	}
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel() // fail immediately
 	g := urlgetter.Getter{