Bump Serde from 0.8.0 to 0.9.1 (#11)

Updated [Serde](https://github.com/agocke/serde-dn) from 0.8.0 to 0.9.1.

<details>
<summary>Release notes</summary>

_Sourced from [Serde's
releases](https://github.com/agocke/serde-dn/releases)._

## 0.9.1

## What's Changed
* Add helpful extensions by @​agocke in
serdedotnet/serde#275
* Fix reading fixed-size collections via proxies by @​agocke in
serdedotnet/serde#277
* Bump version by @​agocke in
serdedotnet/serde#278


**Full Changelog**:
serdedotnet/serde@v0.9.0...v0.9.1

## 0.9.0

## What's Changed
* Update overview.md by @​agocke in
serdedotnet/serde#265
* Add more benchmarking by @​agocke in
serdedotnet/serde#266
* Support deserializing JsonValue in JsonSerializer by @​agocke in
serdedotnet/serde#267
* Remove out parameter from TryReadIndex by @​agocke in
serdedotnet/serde#268
* Add asm baselining script by @​agocke in
serdedotnet/serde#269
* Reject duplicate fields by default by @​agocke in
serdedotnet/serde#270
* Add IDisposable to IDeserializer interface by @​agocke in
serdedotnet/serde#273
* Update version to v0.9 by @​agocke in
serdedotnet/serde#274


**Full Changelog**:
serdedotnet/serde@v0.8.0...v0.9.0

Commits viewable in [compare
view](serdedotnet/serde@v0.8.0...v0.9.1).
</details>

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: agocke <515774+agocke@users.noreply.github.com>
Co-authored-by: Andy Gocke <andy@commentout.net>

Author: 3 people