chore(deps): update rust crate handlebars to v6 (#254)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [handlebars](https://github.com/sunng87/handlebars-rust) | workspace.dependencies | major | `5.1.2` -> `6.0.0` |

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### Release Notes

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

### [`v6.0.0`](https://github.com/sunng87/handlebars-rust/blob/HEAD/CHANGELOG.md#600---2024-07-20)

[Compare Source](https://github.com/sunng87/handlebars-rust/compare/v5.1.2...v6.0.0)

-   \[Fixed] Various indent issue with partials, empty lines and helpers \[[#&#8203;646](https://github.com/sunng87/handlebars-rust/issues/646)]
    \[[#&#8203;654](https://github.com/sunng87/handlebars-rust/issues/654)] \[[#&#8203;658](https://github.com/sunng87/handlebars-rust/issues/658)]
-   \[Fixed] Bug when accessing nested path \[[#&#8203;651](https://github.com/sunng87/handlebars-rust/issues/651)]
-   \[Added] New public access to `PathSeg` \[[#&#8203;656](https://github.com/sunng87/handlebars-rust/issues/656)]
-   \[Added] New API to set single block params in `BlockContext` \[[#&#8203;655](https://github.com/sunng87/handlebars-rust/issues/655)]
-   \[Added] `From<RenderError>` for `RenderErrorReason` \[[#&#8203;644](https://github.com/sunng87/handlebars-rust/issues/644)]
-   \[Changed] Add `non_exhaustive` attribute to all public memebers \[[#&#8203;647](https://github.com/sunng87/handlebars-rust/issues/647)]
-   \[Changed] `RenderContext` API and improved performance for partial rendering
    \[[#&#8203;661](https://github.com/sunng87/handlebars-rust/issues/661)] \[[#&#8203;662](https://github.com/sunng87/handlebars-rust/issues/662)]
-   \[Changed] Improved error messsage for template parsing \[[#&#8203;638](https://github.com/sunng87/handlebars-rust/issues/638)]

</details>

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Cargo.toml

@@ -76,7 +76,7 @@ cargo_metadata = "0.18.1"
 itertools = "0.13.0"
 testdir = "0.9.1"
 fs_extra = "1.3.0"
-handlebars = "5.1.2"
+handlebars = "6.0.0"
 convert_case = "0.6.0"
 automod = "1.0.14"
 mockall = "0.12.1"