chore(deps): bump io-ts from 2.2.14 to 2.2.15

Bumps [io-ts](https://github.com/gcanti/io-ts) from 2.2.14 to 2.2.15.
- [Release notes](https://github.com/gcanti/io-ts/releases)
- [Changelog](https://github.com/gcanti/io-ts/blob/master/CHANGELOG.md)
- [Commits](gcanti/io-ts@2.2.14...2.2.15)

Signed-off-by: dependabot[bot] <support@github.com>