chore(deps): update rust crate flexbuffers to v25 (#2047)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [flexbuffers](https://google.github.io/flatbuffers/flexbuffers)
([source](https://redirect.github.com/google/flatbuffers)) |
workspace.dependencies | major | `24.0.0` -> `25.0.0` |

---

### Release Notes

<details>
<summary>google/flatbuffers (flexbuffers)</summary>

###
[`v25.1.21`](https://redirect.github.com/google/flatbuffers/blob/HEAD/CHANGELOG.md#25121-January-21-2025)

[Compare
Source](https://redirect.github.com/google/flatbuffers/compare/v24.12.23...v25.1.21)

- Rust Full Reflection
([#&#8203;8102](https://redirect.github.com/google/flatbuffers/issues/8102))
-   Mostly documentation updates hosted at https://flatbuffers.dev

</details>

---

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Cargo.lock

@@ -82,7 +82,7 @@ dyn-hash = "0.2.0"
 enum-iterator = "2.0.0"
 fastlanes = "0.1.5"
 flatbuffers = "24.3.25"
-flexbuffers = "24.0.0"
+flexbuffers = "25.0.0"
 flume = "0.11"
 fsst-rs = "0.4.1"
 futures = { version = "0.3", default-features = false }