Update Rust crate serde_with to 3.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
serde_with	dependencies	minor	3.7.0 -> 3.8.0

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Release Notes

jonasbb/serde_with (serde_with)

### [`v3.8.0`](https://togithub.com/jonasbb/serde_with/releases/tag/v3.8.0): serde_with v3.8.0 [Compare Source](https://togithub.com/jonasbb/serde_with/compare/v3.7.0...v3.8.0) ##### Added - Implement (De)Serialization for Pinned Smart Pointers by [@​Astralchroma](https://togithub.com/Astralchroma) ([#​733](https://togithub.com/jonasbb/serde_with/issues/733)) - Implement `JsonSchemaAs` for `PickFirst` by [@​swlynch99](https://togithub.com/swlynch99) ([#​721](https://togithub.com/jonasbb/serde_with/issues/721)) ##### Changed - Bump `base64` dependency to v0.22 ([#​724](https://togithub.com/jonasbb/serde_with/issues/724)) - Update dev dependencies ##### Fixed - `serde_conv` regressed and triggered `clippy::ptr_arg` and add test to prevent future problems. ([#​731](https://togithub.com/jonasbb/serde_with/issues/731))

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