RFR: forge: use /app/installations/ endpoint for GitHub access tokens

[Jorn Vernee]

On Fri, 10 Jul 2020 09:11:21 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this small patch that changes the REST endpoint for creating GitHub access tokens from
> `/installations/:installation_id/access_tokens` to `/app/installations/:installation_id/access_tokens`. GitHub
> [announced in
> April](https://developer.github.com/changes/2020-04-15-replacing-create-installation-access-token-endpoint/) that they
> are deprecating the `/installations/:installation_id/access_tokens` endpoint and that applications should migrate to
> the `/app/installations/:installation_id/access_tokens` endpoint which features identical semantics.  Thanks, Erik

Marked as reviewed by jvernee (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/703