[CI] Include Author in Release

[beanbeanjuice]

Improvement Description

Right now, it just says the issue number, but does not include the author.

Probably need to wait for googleapis/release-please#2628 and googleapis/release-please-action#1166.

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Checklist

• I have checked for similar issues.
• This is an improvement request, not a feature request, bug report, or security vulnerability report.