tools: be explicit about including key-id

gpg 2.1 no longer includes the key-id by default which breaks
the release script. This makes sure we are explicit about it.

PR-URL: https://github.com/nodejs/node/pull/13309


Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>