Bump dropshot from 0.16.5 to 0.16.6 (#1257)

Bumps [dropshot](https://github.com/oxidecomputer/dropshot) from 0.16.5 to 0.16.6.
- [Changelog](https://github.com/oxidecomputer/dropshot/blob/main/CHANGELOG.adoc)
- [Commits](oxidecomputer/dropshot@v0.16.5...v0.16.6)

---
updated-dependencies:
- dependency-name: dropshot
  dependency-version: 0.16.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -25,7 +25,7 @@ bytes = "1.11.0"
 chrono = { version = "0.4.42", default-features = false, features = ["serde"] }
 clap = { version = "4.5.53" }
 clap-cargo = "0.18.3"
-dropshot = { version = "0.16.5", default-features = false }
+dropshot = { version = "0.16.6", default-features = false }
 env_logger = "0.11.8"
 expectorate = { version = "1.2.0", features = ["predicates"] }
 futures = "0.3.31"