xds-k8s/xlang: switch to testing v1.41.x from v1.40.x (#27525)

diff --git a/tools/internal_ci/linux/grpc_xds_k8s_xlang.sh b/tools/internal_ci/linux/grpc_xds_k8s_xlang.sh
index 0476c1d..c7564df 100755
--- a/tools/internal_ci/linux/grpc_xds_k8s_xlang.sh
+++ b/tools/internal_ci/linux/grpc_xds_k8s_xlang.sh
@@ -25,7 +25,7 @@
 readonly IMAGE_REPO="gcr.io/grpc-testing/xds-interop"
 readonly SERVER_LANG="cpp go java"
 readonly CLIENT_LANG="cpp go java"
-readonly VERSION_TAG="v1.40.x"
+readonly VERSION_TAG="v1.41.x"
 
 #######################################
 # Executes the test case