backend: update deno version for websocket panic fix

Florian Bauckholtrequested to merge
update-deno into master

We previously ran into a fatal race condition in deno's WebSocket stack. See https://github.com/denoland/deno/issues/14240#issuecomment-1270647068 for details.

This issue was fixed in the v1.36.1 release: https://github.com/denoland/deno/issues/14240#issuecomment-1675729271

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