Update google-cloud-core and google-cloud-env gems

google-cloud-env has this noteable change:

- Much more robust retry policy and detection mechanisms for the
  metadata server

google-cloud-core Changelog:
https://github.com/googleapis/google-cloud-ruby/blob/main/google-cloud-core/CHANGELOG.md

google-cloud-env Changelog:
https://github.com/googleapis/ruby-cloud-env/blob/main/CHANGELOG.md

Changelog: changed