Update dependency ws to v8.21.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ws	8.21.0 → 8.21.3

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Release Notes

websockets/ws (ws)

v8.21.3

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Bug fixes

• The server now correctly rejects permessage-deflate offers if the incoming
  client_max_window_bits parameter value is smaller than its configured
  clientMaxWindowBits (e97a20e).

v8.21.2

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Bug fixes

• Fixed a test for CITGM (2eb3be0).

v8.21.1

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Bug fixes

• Empty fragments are now counted toward the limit (a2f4e7c).
• The default values of the maxBufferedChunks and maxFragments options have
  been reduced (f197ac6).

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