chore(deps): update thiserror requirement from 1 to 2 in /src-tauri

[dependabot]

Updates the requirements on thiserror to permit the latest version.

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
• Additional commits viewable in compare view

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