Updates heroku-go to the latest revision

[alindeman]

After many years of being broken, schematic and heroku-go can generate the Heroku API again 🎉

But the generated code looks a bit different now and also requires passing a context.Context as the first argument.

This PR does not introduce any functionality, but does update the library to the latest revision. It will, however, open the door to implementing long-requested functionality like pipelines and spaces.

[alindeman]

=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccHerokuAddon_Basic
--- PASS: TestAccHerokuAddon_Basic (2.60s)
=== RUN   TestAccHerokuAddon_noPlan
--- PASS: TestAccHerokuAddon_noPlan (3.29s)
=== RUN   TestAccHerokuApp_Basic
--- PASS: TestAccHerokuApp_Basic (1.51s)
=== RUN   TestAccHerokuApp_NameChange
--- PASS: TestAccHerokuApp_NameChange (2.91s)
=== RUN   TestAccHerokuApp_NukeVars
--- PASS: TestAccHerokuApp_NukeVars (2.62s)
=== RUN   TestAccHerokuApp_Organization
--- SKIP: TestAccHerokuApp_Organization (0.00s)
        resource_heroku_app_test.go:121: HEROKU_ORGANIZATION is not set; skipping test.
=== RUN   TestAccHerokuCert_Basic
--- PASS: TestAccHerokuCert_Basic (9.81s)
=== RUN   TestAccHerokuDomain_Basic
--- PASS: TestAccHerokuDomain_Basic (1.99s)
=== RUN   TestAccHerokuDrain_Basic
--- PASS: TestAccHerokuDrain_Basic (1.97s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/heroku 26.716s

[stack72]

This is fantastic news - thanks so much for this @alindeman :) LGTM!

[ghost]

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