Bump thiserror from 2.0.20 to 2.0.21

[dependabot]

Bumps thiserror from 2.0.20 to 2.0.21.

Release notes

Sourced from thiserror's releases.

2.0.21

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

Commits

• b1827ee Release 2.0.21
• 58037b5 Merge pull request #459 from dtolnay/turbofish
• f82a0cf Keep track of nested turbofish depth
• 72ea492 Raise required compiler to Rust 1.77
• 72eea0d Resolve io_other_error clippy lint in tests
• 07f09a2 Raise required compiler to Rust 1.74
• 2715388 Update ui test suite to nightly-2026-09-22
• 5a306c7 Update ui test suite to nightly-2026-09-05
• ef9383b Update ui test suite to nightly-2026-08-22
• 8336b84 Update ui tests for version 2.0.20
• See full diff in compare view

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[gcomte]

Dependency upgrade assessment — commit 108705e9306af176ddde743607977496898c4111

No follow-up changes are needed. The PR upgrades thiserror and thiserror-impl from 2.0.20 to 2.0.21. Upstream’s parser fix does not affect the project’s error expressions, and its increased Rust minimum remains below the project’s declared minimum. All six configured checks passed, including 60 tests. The input snapshot is unchanged; retain the existing Dependabot patch.

Findings:

• The full comparison against the supplied base changes only Cargo.lock: thiserror and thiserror-impl both move from 2.0.20 to 2.0.21. There is one package and no additional workspaces. Cargo.toml retains the compatible thiserror requirement "2.0.18".
• The official release fixes parsing of generic unit variants and nested turbofish expressions in error display arguments. AmountError, CurrencyParseError, InputError, and ConversionError use literal messages or simple field interpolation; none uses the affected syntax or a workaround needing replacement. Sources: https://github.com/dtolnay/thiserror/releases/tag/2.0.21 and dtolnay/thiserror@2.0.20...2.0.21
• The source comparison additionally reveals a Rust minimum increase from 1.71 to 1.77 for both crates. bitcoinvert already declares Rust 1.95.0 and uses stable CI toolchains, so no toolchain changes are needed. Remaining upstream changes concern internal tests and diagnostic snapshots; no applicable API removals, feature-default changes, or new simplifications were found.
• Version-specific API documentation confirms that existing display interpolation and Arithmetic(#[from] AmountError) remain supported, with #[from] implying an error source. Existing tests exercise generated conversion and display behavior through overflow, invalid-input diagnostics, exit codes, and empty output on failure. Adding a generic-expression test would exercise unused upstream functionality. Source: https://github.com/dtolnay/thiserror/blob/2.0.21/src/lib.rs
• Validation used Rust 1.98.1 on the available host, including successful live blockchain.info requests. Rust 1.95 and other platforms were not separately executed. No changes or additional tests were warranted, and no applicable migration was deferred.

The session reported running checks. No independent validation was run for this result.