fix(deps): update rust crate rgb to v0.8.40

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rgb (source)	dependencies	patch	0.8.37 -> 0.8.40

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Release Notes

kornelski/rust-rgb (rgb)

### [`v0.8.40`](https://togithub.com/kornelski/rust-rgb/compare/v0.8.37...v0.8.40) [Compare Source](https://togithub.com/kornelski/rust-rgb/compare/v0.8.37...v0.8.40)

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