fix(deps): update rust crate document-features to 0.2.8 (#554)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [document-features](https://slint-ui.com)
([source](https://github.com/slint-ui/document-features)) |
dependencies | patch | `0.2` -> `0.2.8` |

---

### Release Notes

<details>
<summary>slint-ui/document-features (document-features)</summary>

###
[`v0.2.8`](https://github.com/slint-ui/document-features/compare/v0.2.7...v0.2.8)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.7...v0.2.8)

###
[`v0.2.7`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#027---2023-12-29)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.6...v0.2.7)

- Remove `\n` between features
([#&#8203;17](https://github.com/slint-ui/document-features/issues/17))
- Don't throw an error when there is no features in Cargo.toml
([#&#8203;20](https://github.com/slint-ui/document-features/issues/20))

###
[`v0.2.6`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#026---2022-09-24)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.5...v0.2.6)

-   Fix parsing of escaped string literal in the macro arguments

###
[`v0.2.5`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#025---2022-09-17)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.4...v0.2.5)

- Allow customization of the output with the `feature_label=` parameter

###
[`v0.2.4`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#024---2022-09-14)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.3...v0.2.4)

-   Fix dependencies or features written with quotes

###
[`v0.2.3`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#023---2022-08-15)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.2...v0.2.3)

- Fix parsing of table with `#` within strings
([#&#8203;10](https://github.com/slint-ui/document-features/issues/10))

###
[`v0.2.2`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#022---2022-07-25)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.1...v0.2.2)

- Fix parsing of dependencies or feature spanning multiple lines
([#&#8203;9](https://github.com/slint-ui/document-features/issues/9))

###
[`v0.2.1`](https://github.com/slint-ui/document-features/blob/HEAD/CHANGELOG.md#021---2022-02-12)

[Compare
Source](https://github.com/slint-ui/document-features/compare/v0.2.0...v0.2.1)

- Fix indentation of multi-lines feature comments
([#&#8203;5](https://github.com/slint-ui/document-features/issues/5))

</details>

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Cargo.toml

@@ -61,7 +61,7 @@ axum = { version = "0.7.5", optional = true, features = ["macros"] }
 axum-extra = { version = "0.9.3", optional = true, features = ["typed-header"] }
 base64-compat = { version = "1", optional = true }
 custom_error = "1.9.2"
-document-features = { version = "0.2", optional = true }
+document-features = { version = "0.2.8", optional = true }
 jsonwebtoken = { version = "9.3.0", optional = true }
 openidconnect = { version = "3.5.0", optional = true }
 pbjson-types = { version = "0.6", optional = true }