Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.14 to 1.0.15. - [Release notes](https://github.com/dtolnay/thiserror/releases) - [Commits](https://github.com/dtolnay/thiserror/compare/1.0.14...1.0.15) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>