chore(master): release 2.2.1

[release-please[bot]]

:robot: I have created a release beep boop

2.2.1 (2022-05-24)

Bug Fixes

• add variable type in variables.tf (#70) (2cfe6d3)

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[comment-bot-dev]

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[release-please[bot]]

:robot: Release is at https://github.com/terraform-google-modules/terraform-google-cloud-nat/releases/tag/v2.2.1 :sunflower: