Update Rust crate handlebars to 4.3.7 (#1894)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [handlebars](https://github.com/sunng87/handlebars-rust) | dependencies | patch | `4.3.6` -> `4.3.7` |

---

### Release Notes

<details>
<summary>sunng87/handlebars-rust</summary>

### [`v4.3.7`](https://github.com/sunng87/handlebars-rust/releases/tag/v4.3.7)

[Compare Source](sunng87/handlebars-rust@v4.3.6...v4.3.7)

-   \[Fixed] Use fully qualified name of `Result` in `handlebars_helper` macro \[[#&#8203;578](sunng87/handlebars-rust#578)]
-   \[Fixed] Allow single-quote JSON literal \[[#&#8203;577](sunng87/handlebars-rust#577)]

</details>

---

### Configuration

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, 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 has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNS45Ni4yIiwidXBkYXRlZEluVmVyIjoiMzUuOTYuMiIsInRhcmdldEJyYW5jaCI6ImRldmVsb3AifQ==-->

Co-authored-by: cabr2-bot <cabr2.help@gmail.com>
Co-authored-by: crapStone <crapstone01@gmail.com>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1894
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>
Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>

crates/load_save/Cargo.toml

@@ -12,7 +12,7 @@ edition = "2021"
 [dependencies]
 async-trait = "0.1.68"
 chrono = { version = "0.4.24", default-features = false, optional = true }
-handlebars = { version = "4.3.6", optional = true }
+handlebars = { version = "4.3.7", optional = true }
 lazy_static = "1.4.0"
 log = "0.4.19"
 lopdf = { version = "0.30.0", optional = true }