Update Rust crate indoc to v2.0.6 (#26177)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indoc](https://redirect.github.com/dtolnay/indoc) |
workspace.dependencies | patch | `2.0.5` -> `2.0.6` |

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### Release Notes

<details>
<summary>dtolnay/indoc (indoc)</summary>

###
[`v2.0.6`](https://redirect.github.com/dtolnay/indoc/releases/tag/2.0.6)

[Compare
Source](https://redirect.github.com/dtolnay/indoc/compare/2.0.5...2.0.6)

-   Documentation improvements

</details>

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### Configuration

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

- N/A

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