[Developer] Use pull_request_target for PR JIRA integration

[asfimport]

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

PRs and other links:

• GitHub Pull Request #9087

_{Note: This issue was originally created as ARROW-11121. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 9087
#9087