chore(deps): update rust crate serde_json to v1.0.137 (#295)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [serde_json](https://redirect.github.com/serde-rs/json) |
dev-dependencies | patch | `1.0.136` -> `1.0.137` |

---

### Release Notes

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

###
[`v1.0.137`](https://redirect.github.com/serde-rs/json/releases/tag/v1.0.137)

[Compare
Source](https://redirect.github.com/serde-rs/json/compare/v1.0.136...v1.0.137)

- Turn on "float_roundtrip" and "unbounded_depth" features for
serde_json in play.rust-lang.org
([#&#8203;1231](https://redirect.github.com/serde-rs/json/issues/1231))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

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

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/apollographql/subgraph-template-rust-async-graphql).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xMDcuMCIsInVwZGF0ZWRJblZlciI6IjM5LjEwNy4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]