RFR: 2467: Skara bot mistakenly reset the committer when amending commit message

[Zhao Song]

On Tue, 25 Mar 2025 19:21:34 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Kevin Rushforth reported that this commit(https://github.com/openjdk/skara/commit/e0767b8b621b18c813ea579161791a836625d540) was sponsored by Magnus, so Magnus should be the committer, however, Tobias was set as the committer.
> 
> After investigation, I found that there is a stale review in the pr, so the bot amended the commit before pushing it. When amending the commit, the bot should only amend the commit message, however, it also reset the committer.

Thank you for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1711#issuecomment-2752402962