Update Rust crate tokio-tungstenite to 0.21

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio-tungstenite	workspace.dependencies	minor	0.20 -> 0.21

---

Release Notes

snapview/tokio-tungstenite (tokio-tungstenite)

v0.21.0

Compare Source

• Update TLS dependencies.
• Update tungstenite to 0.21.0.

---

Configuration

📅 Schedule: Branch creation - "after 8pm,before 6am" in timezone America/Los_Angeles, Automerge - "after 8pm,before 6am" in timezone America/Los_Angeles.

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot.

[oxide-renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path Cargo.toml --package tokio-tungstenite@0.20.1 --precise 0.21.0
    Updating crates.io index
error: failed to select a version for the requirement `tokio-tungstenite = "^0.20"`
candidate versions found which didn't match: 0.21.0
location searched: crates.io index
required by package `propolis-client v0.1.0 (https://github.com/oxidecomputer/propolis?rev=ff6c4df2e816eee6e7b2b0488777d30ef35ee217#ff6c4df2)`
    ... which satisfies git dependency `propolis-client` (locked to 0.1.0) of package `omicron-sled-agent v0.1.0 (/tmp/renovate/repos/github/oxidecomputer/omicron/sled-agent)`
    ... which satisfies path dependency `omicron-sled-agent` (locked to 0.1.0) of package `nexus-db-queries v0.1.0 (/tmp/renovate/repos/github/oxidecomputer/omicron/nexus/db-queries)`
    ... which satisfies path dependency `nexus-db-queries` (locked to 0.1.0) of package `omicron-omdb v0.1.0 (/tmp/renovate/repos/github/oxidecomputer/omicron/dev-tools/omdb)`
perhaps a crate was updated and forgotten to be re-vendored?

[sunshowers]

Blocked on propolis-client, and may need to be clubbed with a rustls update (#4617).

[sunshowers]

Going to close this to minimize churn.

[oxide-renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update (0.21). You will get a PR once a newer version is released. To ignore this dependency forever, add it to the ignoreDeps array of your Renovate config.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.