Update Rust crate thiserror to 1.0.50

This MR contains the following updates:

Package	Type	Update	Change
thiserror	dependencies	patch	1.0.49 -> 1.0.50

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Release Notes

dtolnay/thiserror (thiserror)

v1.0.50

Compare Source

• Improve diagnostic when a #[source], #[from], or #[transparant] attribute refers to a type that has no std::error::Error impl (#​258, thanks @​de-vri-es)

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