Update thiserror requirement from 1.0 to 2.0

[dependabot[bot]]

Updates the requirements on thiserror to permit the latest version.

Release notes

Sourced from thiserror's releases.

2.0.12

• Prevent elidable_lifetime_names pedantic clippy lint in generated impl (#413)

Commits

• 95a5126 Release 2.0.12
• 76490f7 Merge pull request #413 from dtolnay/elidablelifetime
• 9f27b76 Ignore elidable_lifetime_names pedantic clippy lint
• daf2a6f Resolve some elidable_lifetime_names pedantic clippy lint
• 5f07160 Point standard library links to stable
• 6706a51 Convert html links to intra-doc links
• 2706873 More precise gitignore patterns
• 70bc20d Remove **/*.rs.bk from project-specific gitignore
• 0f532e3 Release 2.0.11
• 3d15543 Merge pull request #410 from dtolnay/testnostd
• Additional commits viewable in compare view

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