Update deprecated buildpack #3406
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Change Summary
heroku/buildpacks:20 was recently deprecated and now
packbuilds error when trying to use it.This commit updates all uses of that buildpack to heroku/buildpacks:22 which is still supported.
What and Why:
Builds result in this error:
ERROR: This builder image (heroku/buildpacks:20) has been sunset,
since it uses legacy shimmed classic Heroku buildpacks, rather than
Heroku's next-generation Cloud Native Buildpacks.
As such, this image is no longer supported and will soon stop receiving
security updates.
Documentation