chore(deps): 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

• 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
• 78d1096 typo
• See full diff in compare view

You can trigger a rebase of this PR by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

Note
Automatic rebases have been disabled on this pull request as it has been open for over 30 days.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.