Update Rust crate indoc to v2 (#305)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indoc](https://github.com/dtolnay/indoc) | dependencies | major | `1.0` -> `2.0` |

---

### Release Notes

<details>
<summary>dtolnay/indoc</summary>

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

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

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

### [`v1.0.9`](https://github.com/dtolnay/indoc/releases/tag/1.0.9)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.8...1.0.9)

-   Fix parsing of some edge cases involving angle brackets in writedoc's expr argument ([#&#8203;54](https://github.com/dtolnay/indoc/issues/54))

### [`v1.0.8`](https://github.com/dtolnay/indoc/releases/tag/1.0.8)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.7...1.0.8)

-   Documentation improvements

### [`v1.0.7`](https://github.com/dtolnay/indoc/releases/tag/1.0.7)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.6...1.0.7)

-   Add categories to crates.io metadata

### [`v1.0.6`](https://github.com/dtolnay/indoc/releases/tag/1.0.6)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.5...1.0.6)

-   Vendor `unindent` crate to reduce depth of build graph

### [`v1.0.5`](https://github.com/dtolnay/indoc/releases/tag/1.0.5)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.4...1.0.5)

-   Work around "invisible delimiters" change in nightly compiler

### [`v1.0.4`](https://github.com/dtolnay/indoc/releases/tag/1.0.4)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.3...1.0.4)

-   Add `rust-version` entry to Cargo.toml to declare the oldest supported compiler version

### [`v1.0.3`](https://github.com/dtolnay/indoc/releases/tag/1.0.3)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.2...1.0.3)

-   Fix incorrect handling of strings starting with \r\n by unindent and unindent_bytes ([#&#8203;43](https://github.com/dtolnay/indoc/issues/43))

### [`v1.0.2`](https://github.com/dtolnay/indoc/releases/tag/1.0.2)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.1...1.0.2)

-   Fix support for using a macro_rules metavariable as the string literal argument: `indoc!($lit)` ([#&#8203;39](https://github.com/dtolnay/indoc/issues/39))

### [`v1.0.1`](https://github.com/dtolnay/indoc/releases/tag/1.0.1)

[Compare Source](https://github.com/dtolnay/indoc/compare/1.0.0...1.0.1)

-   Documentation improvements

</details>

---

### Configuration

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---

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Author: stackable-bot

Cargo.lock

@@ -13,7 +13,7 @@ stackable-operator = { git = "https://github.com/stackabletech/operator-rs.git",
 stackable-hdfs-crd = { path = "../crd" }
 
 futures = "0.3"
-indoc = "1.0"
+indoc = "2.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 snafu = "0.7"