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GH-44974: [Dev] Fix minor issue handling (#44975)

### Rationale for this change

The current implementation works for `GH-XXX` PRs but doesn't work for `MINOR` PRs.

### What changes are included in this PR?

Add a missing `issue.kind` check.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.

* GitHub Issue: #44974

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>