Update Rust crate thiserror to v2.0.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
thiserror	dependencies	patch	2.0.20 → 2.0.21

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Release Notes

dtolnay/thiserror (thiserror)

v2.0.21

Compare Source

• Fix parsing of generic unit variants in display expressions (#​459)

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