Update Rust crate indoc to v2 (#15247)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indoc](https://togithub.com/dtolnay/indoc) | workspace.dependencies |
major | `1` -> `2` |

---

### Release Notes

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

### [`v2.0.5`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.5)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/2.0.4...2.0.5)

- Documentation improvements
([#&#8203;62](https://togithub.com/dtolnay/indoc/issues/62), thanks
[@&#8203;ilyagr](https://togithub.com/ilyagr))

### [`v2.0.4`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.4)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/2.0.3...2.0.4)

- Fix handling of \r\n ending on first line
([#&#8203;61](https://togithub.com/dtolnay/indoc/issues/61), thanks
[@&#8203;PizzasBear](https://togithub.com/PizzasBear))

### [`v2.0.3`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.3)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/2.0.2...2.0.3)

-   Documentation improvements

### [`v2.0.2`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.2)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/2.0.1...2.0.2)

-   Add `no-alloc` category to crates.io metadata

### [`v2.0.1`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.1)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/2.0.0...2.0.1)

-   Set html_root_url attribute

### [`v2.0.0`](https://togithub.com/dtolnay/indoc/releases/tag/2.0.0)

[Compare
Source](https://togithub.com/dtolnay/indoc/compare/1.0.9...2.0.0)

- Change handling of final newline at zero levels of indentation
([#&#8203;55](https://togithub.com/dtolnay/indoc/issues/55))
- Add [`concatdoc!`](https://docs.rs/indoc/2/indoc/macro.concatdoc.html)
macro ([#&#8203;56](https://togithub.com/dtolnay/indoc/issues/56))
-   Raise oldest supported rustc to 1.56

</details>

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Release Notes:

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Cargo.lock

@@ -348,7 +348,7 @@ html5ever = "0.27.0"
 ignore = "0.4.22"
 image = "0.25.1"
 indexmap = { version = "1.6.2", features = ["serde"] }
-indoc = "1"
+indoc = "2"
 # We explicitly disable http2 support in isahc.
 isahc = { version = "1.7.2", default-features = false, features = [
     "text-decoding",