Update Rust crate kubewarden-policy-sdk to 0.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
kubewarden-policy-sdk	dependencies	patch	0.8.2 -> 0.8.4

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Release Notes

kubewarden/policy-sdk-rust

### [`v0.8.4`](https://togithub.com/kubewarden/policy-sdk-rust/releases/tag/v0.8.4): Kubewarden Rust SDK v0.8.4 [Compare Source](https://togithub.com/kubewarden/policy-sdk-rust/compare/v0.8.3...v0.8.4) ### [`v0.8.3`](https://togithub.com/kubewarden/policy-sdk-rust/releases/tag/v0.8.3): Kubewarden Rust SDK v0.8.3 [Compare Source](https://togithub.com/kubewarden/policy-sdk-rust/compare/v0.8.2...v0.8.3)

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Configuration

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