[add] py-graphql-ws: new recipe, required by py-cylc-uiserver (#39991)

* [add] py-graphql-ws: new recipe, required by py-cylc-uiserver

* py-graphql-ws: remove constraint on version for python

var/spack/repos/builtin/packages/py-graphql-ws/package.py

@@ -0,0 +1,20 @@
+# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyGraphqlWs(PythonPackage):
+    """Websocket backend for GraphQL subscriptions."""
+
+    homepage = "https://github.com/graphql-python/graphql-ws"
+    pypi = "graphql-ws/graphql-ws-0.4.4.tar.gz"
+
+    maintainers("LydDeb")
+
+    version("0.4.4", sha256="2ad38db70f37964f54d7eb3e2ede86dbe3f2a1ed7ea0a9f9a3b8b17162a22852")
+
+    depends_on("py-setuptools", type="build")
+    depends_on("py-graphql-core@2", type=("build", "run"))