Update tokio-tungstenite requirement from 0.20 to 0.21

[dependabot]

Updates the requirements on tokio-tungstenite to permit the latest version.

Changelog

Sourced from tokio-tungstenite's changelog.

0.20.1

• Fix RUSTSEC-2023-0053.
• Fix transitive CVE-2023-43669 from tungstenite.

0.20.0

• Change the buffering behavior for Sink::send() and Sink::feed(), see tungstenite's changelog for more details.

0.19.0

• Allow users to enable/disable Nagle algorithm when using connect() helpers.
• Improve the behavior of the Sink for the WebSocketStream, so it does not return an error when it’s not necessary (when poll_flush() is called on a connection that has just been closed).
• Workaround an issue where rustls TLS backend expected domain in a certain format and reject IPv6 addresses if they contained square brackets in them.
• Update dependencies and remove unused errors.

0.18.0

• Update dependencies (underlying tungstenite core).

0.17.2

• Make Origin header case-sensitive (to keep compatibility with poorely-written servers that don't accept lowercase Origin header).
• Make semantics of the reading form the WebSocketStream more reasonable (return None instead of an error when the stream is normally closed).
• Imrpove the way poll_close() works by properly driving the close of the stream till completion.

0.17.1

• Update the tungstenite dependency (fixes a panic in tungstenite and MSRV), see tungstenite's changelog for more details.

0.17.0

• Update the dependencies, please refer to the tungstenite changelog for the actual changes.

0.16.1

• Fix feature selection problem when using TLS.

0.16.0

• Add a function to allow to specify the TLS connector when using connect() like logic.
• Add support for choosing the right root certificates for the TLS.
• Change the behavior of the connect() so that it fails when using TLS without TLS feature.
• Do not project with Unpin.
• Update the dependencies with important implications / improvements.

0.15.0

• Update the tungstenite-rs version to 0.14.0, check tungstenite-rs release for more details.

... (truncated)

Commits

• 52e59dd Release version 0.21.0
• 7b2cf20 Update rustls to 0.22 and tokio-rustls to 0.25
• ecf7a7e Update webpki-roots to 0.26
• 27b9830 Prepare a new release, bump version
• e36abf8 Merge pull request #298 from lightydo/master
• 9be8881 fix rustls-tls-webpki-roots build
• e79e2f2 update webpki-roots
• 4570995 update tokio-rustls to fix RUSTSEC-2023-0053
• 4c7e39b update rustls to fix RUSTSEC-2023-0053
• 71d06d4 Merge pull request #294 from oskgo/patch-1
• Additional commits viewable in compare view

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (446279d) 78.73% compared to head (3b1f736) 78.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #639      +/-   ##
==========================================
- Coverage   78.73%   78.54%   -0.20%     
==========================================
  Files          72       72              
  Lines        2088     2088              
==========================================
- Hits         1644     1640       -4     
- Misses        444      448       +4     

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