Merge #1728

1728: Bump thiserror from 1.0.6 to 1.0.9 r=mergify[bot] a=dependabot-preview[bot]

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.6 to 1.0.9.
<details>
<summary>Release notes</summary>

*Sourced from [thiserror's releases](https://github.com/dtolnay/thiserror/releases).*

> ## 1.0.9
> - Fix bug affecting display attributes of the form `#[error("{}", some_expression)]` (where the format string is `"{}"` and nothing else, and the value formatted is not just one of the fields from the error) [#53](https://github-redirect.dependabot.com/dtolnay/thiserror/issues/53)
> 
> ## 1.0.8
> - Documentation improvements
> 
> ## 1.0.7
> - Support mixing shorthand and non-shorthand format args ([#47](https://github-redirect.dependabot.com/dtolnay/thiserror/issues/47))
> 
>     ```rust
>     #[derive(Error, Debug)]
>     pub enum Error {
>         #[error("first letter must be lowercase but was {:?}", first_char(.0))]
>         WrongCase(String),
>         #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)]
>         OutOfBounds { idx: usize, limits: Limits },
>     }
>     ```
> 
> - Add #\[error(transparent)\] attribute for delegating Error impl to one field ([#50](https://github-redirect.dependabot.com/dtolnay/thiserror/issues/50))
> 
>     This is useful for hiding error variants from a library's public error type:
> 
>     ```rust
>     #[derive(Error, Debug)]
>     #[error(transparent)]  // source and Display delegate to ErrorKind
>     pub struct Error(ErrorKind);
> 
>     #[derive(Error, Debug)]
>     /*private*/ enum ErrorKind {
>         #[error("...")]
>         E0,
>         #[error("...")]
>         E1(#[source] io::Error),
>     }
>     ```
> 
>     And also for enums that need an "anything else" variant; such variants tend not to have their own Display message but just forward through to the underlying error's Display and source:
> 
>     ```rust
>     #[derive(Error, Debug)]
>     pub enum MyError {
>         ...
> 
>         #[error(transparent)]
>         Other(#[from] anyhow::Error),  // source and Display delegate to anyhow::Error
>     }
>     ```
</details>
<details>
<summary>Commits</summary>

- [`1d0b399`](dtolnay/thiserror@1d0b399) Release 1.0.9
- [`20202db`](dtolnay/thiserror@20202db) Remove incorrect detection of simple fmt cases
- [`d53be52`](dtolnay/thiserror@d53be52) Release 1.0.8
- [`26a5af1`](dtolnay/thiserror@26a5af1) Update documentation of display attr
- [`79b740e`](dtolnay/thiserror@79b740e) Release 1.0.7
- [`05f0a0f`](dtolnay/thiserror@05f0a0f) Add trybuild tests for transparent feature
- [`62e8e66`](dtolnay/thiserror@62e8e66) Merge pull request [#50](https://github-redirect.dependabot.com/dtolnay/thiserror/issues/50) from dtolnay/transparent
- [`ac61f40`](dtolnay/thiserror@ac61f40) Test transparent attribute
- [`c3da163`](dtolnay/thiserror@c3da163) Expand transparent attribute
- [`7672b1e`](dtolnay/thiserror@7672b1e) Validate transparent attribute
- Additional commits viewable in [compare view](dtolnay/thiserror@1.0.6...1.0.9)
</details>
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Author: bors[bot]