Update dependency ws to ~8.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ws	~8.19.0 → ~8.20.0

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Release Notes

websockets/ws (ws)

v8.20.0

Compare Source

Features

• Added exports for the PerMessageDeflate class and utilities for the
  Sec-WebSocket-Extensions and Sec-WebSocket-Protocol headers (d3503c1).

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5a3c5fd) to head (581c3bf).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #429   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          133       133           
=========================================
  Hits           133       133           

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