Update websocket version in snowflake proxy
We should update the node websocket dependency to a newer version.
This involves editing
package.json to require the newer version, and testing the result to make sure the proxy code still performs as expected.
This is to defend against a reported DoS vulnerability: https://github.com/websockets/ws/commit/c4fe46608acd61fbf7397eadc47378903f95b78a