build(deps): bump idna from 0.2.0 to 0.2.1
Bumps [idna](https://github.com/servo/rust-url) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/servo/rust-url/releases)
- [Commits](https://github.com/servo/rust-url/compare/idna-v0.2.0...v0.2.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>