Node.js Unified SDK v6.1.0

This is a minor version update that adds official support for Node.js 22. We've updated the package.json to reflect this as well as our test matrix. There are also additional minor updates noted below as part of the release.

What's Changed

  • Add linter / formatter for examples
  • Add Node.js 22 support
  • Update GitHub Actions

Full Changelog: https://github.com/bitpay/nodejs-bitpay-client/compare/6.0.2...6.1.0