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Upgrade Heroku builder image to version 22

Timo Furrer requested to merge upgrade-heroku-builder-22 into master

This change set upgrades the default AUTO_DEVOPS_BUILD_IMAGE_CNB_BUILDER from heroku/builder:20 to heroku/builder:22.

This is a breaking change!

Users are advised to upgrade their projects to be either compatible with heroku/builder:22 or set the AUTO_DEVOPS_BUILD_IMAGE_CNB_BUILDER environment variable to an image reference of their choosing.

More information about the Heroku images can be found in the Heroku cnb-builder-images project README at https://github.com/heroku/cnb-builder-images.

Closes #73 (closed)

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