Remove unused code

cypress/plugins/utils/port.ts

@@ -1,27 +0,0 @@
-/*
-Copyright 2022 The Matrix.org Foundation C.I.C.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-import * as net from "net";
-
-export async function getFreePort(): Promise<number> {
-    return new Promise<number>(resolve => {
-        const srv = net.createServer();
-        srv.listen(0, () => {
-            const port = (<net.AddressInfo>srv.address()).port;
-            srv.close(() => resolve(port));
-        });
-    });
-}