[Release][Java] Add missing files to list of artifacts to deploy

[asfimport]

The arrow-flight pom and so on are currently not being deployed, see https://lists.apache.org/thread/fbrgvf30os5h4ox7fk4txrlgdp1g5g4g

Reporter: Bryan Cutler / @BryanCutler
Assignee: Bryan Cutler / @BryanCutler

Related issues:

• [Java] Maven cannot find Arrow 7.0.0 (duplicates)
• [Release][Java] Verify staged maven artifacts (is related to)

PRs and other links:

• GitHub Pull Request apache/arrow#12481

_{Note: This issue was originally created as ARROW-15746. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 12481
#12481