Update Rust crate iddqd to 0.3.16 (#2751)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [iddqd](https://redirect.github.com/oxidecomputer/iddqd) |
workspace.dependencies | patch | `0.3.15` -> `0.3.16` |

---

### Release Notes

<details>
<summary>oxidecomputer/iddqd (iddqd)</summary>

###
[`v0.3.16`](https://redirect.github.com/oxidecomputer/iddqd/blob/HEAD/CHANGELOG.md#0316---2025-11-09)

[Compare
Source](https://redirect.github.com/oxidecomputer/iddqd/compare/iddqd-0.3.15...iddqd-0.3.16)

##### Added

- `clear` methods for all map types to remove all items from the map.
- Optionally, serialize ID maps as maps (JSON objects) rather than
sequences (JSON arrays):
- New `IdHashMapAsMap`, `BiHashMapAsMap`, `TriHashMapAsMap`, and
`IdOrdMapAsMap` marker types to use with `#[serde(with = ...)]`.
- The default deserializer for each map now accepts both maps and
sequences.

##### Changed

- Documentation improvements for serde implementations.

</details>

---

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Author: nextest-bot

Cargo.lock

@@ -67,7 +67,7 @@ home = "0.5.11"
 http = "1.3.1"
 humantime = "2.3.0"
 humantime-serde = "1.1.1"
-iddqd = "0.3.15"
+iddqd = "0.3.16"
 # Disable punycode parsing since we only access well-known domains.
 idna_adapter = "=1.0.0"
 indenter = "0.3.4"