Bump bitpay/key-utils from 2.0.6 to 2.1.0

Bumps [bitpay/key-utils](https://github.com/bitpay/bitpay-php-keyutils) from 2.0.6 to 2.1.0.
- [Release notes](https://github.com/bitpay/bitpay-php-keyutils/releases)
- [Commits](bitpay/bitpay-php-keyutils@2.0.6...2.1.0)

---
updated-dependencies:
- dependency-name: bitpay/key-utils
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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