Bump bitpay/key-utils from 2.1.0 to 2.1.1

Bumps [bitpay/key-utils](https://github.com/bitpay/bitpay-php-keyutils) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/bitpay/bitpay-php-keyutils/releases)
- [Commits](bitpay/bitpay-php-keyutils@2.1.0...2.1.1)

---
updated-dependencies:
- dependency-name: bitpay/key-utils
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]