Fix the stack check error message for Heroku-20#1860
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The `heroku-20` entry was removed completely in #1778 rather than moving it to the EOL branch of the conditional, causing the "stack not recognised" message variant to be shown, instead of the "stack no longer supported" version. This error messages can never occur on Heroku (since our build system can only scheduled builds for supported stacks), but these cases can be hit for non-Heroku uses of this buildpack (such as Dokku). GUS-W-19274871.
schneems
approved these changes
Aug 6, 2025
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The
heroku-20entry was removed completely in #1778 rather than moving it to the EOL branch of the conditional, causing the "stack not recognised" message variant to be shown, instead of the "stack no longer supported" version.This error messages can never occur on Heroku (since our build system can only scheduled builds for supported stacks), but these cases can be hit for non-Heroku uses of this buildpack (such as Dokku).
GUS-W-19274871.