Remove usage of legacy codon-buildpacks buildpack URL (#66)
Remove usage of legacy codon-buildpacks buildpack URL (#66)

The `codon-buildpacks` S3 bucket has been deprecated for many years, having been replaced by the buildpack registry shorthand aliases, which map to the `buildpack-registry` S3 bucket instead.

With this change, the docs now say to use the official Heroku Go buildpack rather than a third-party's from a legacy S3 bucket.

GUS-W-10034067.
heroku/log-iss,heroku/log-iss