Update serde monorepo to v1.0.208 (#16647)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [serde](https://serde.rs)
([source](https://togithub.com/serde-rs/serde)) | dependencies | patch |
`1.0.207` -> `1.0.208` |
| [serde](https://serde.rs)
([source](https://togithub.com/serde-rs/serde)) | workspace.dependencies
| patch | `1.0.207` -> `1.0.208` |
| [serde_derive](https://serde.rs)
([source](https://togithub.com/serde-rs/serde)) | workspace.dependencies
| patch | `1.0.207` -> `1.0.208` |

---

### Release Notes

<details>
<summary>serde-rs/serde (serde)</summary>

###
[`v1.0.208`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.208)

[Compare
Source](https://togithub.com/serde-rs/serde/compare/v1.0.207...v1.0.208)

- Support serializing and deserializing unit structs in a `flatten`
field ([#&#8203;2802](https://togithub.com/serde-rs/serde/issues/2802),
thanks [@&#8203;jonhoo](https://togithub.com/jonhoo))

</details>

---

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---

Release Notes:

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Cargo.lock

@@ -9573,18 +9573,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.207"
+version = "1.0.208"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5665e14a49a4ea1b91029ba7d3bca9f299e1f7cfa194388ccc20f14743e784f2"
+checksum = "cff085d2cb684faa248efb494c39b68e522822ac0de72ccf08109abde717cfb2"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.207"
+version = "1.0.208"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6aea2634c86b0e8ef2cfdc0c340baede54ec27b1e46febd7f80dffb2aa44a00e"
+checksum = "24008e81ff7613ed8e5ba0cfaf24e2c2f1e5b8a0495711e44fcd4882fca62bcf"
 dependencies = [
  "proc-macro2",
  "quote",