Remove support for heroku-20 stack #168
Merged
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Since the Heroku-20 stack has reached end-of-life, and as such builds using it are no longer supported by the Heroku build system: https://devcenter.heroku.com/changelog-items/3230
This fixes the integration tests failing in CI for the Heroku-20 stack, due to the build system now (as expected) rejecting the jobs.
Any non-Heroku consumers of this buildpack that wish to continue using the Heroku-20 stack should pin to the previous version of this buildpack.