[Website] Update committers and PMC roster on website



**Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-3106) / @wesm
**Assignee**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-3106) / @wesm
#### PRs and other links:
- [GitHub Pull Request #2457](https://github.com/apache/arrow/pull/2457)

<sub>**Note**: *This issue was originally created as [ARROW-3106](https://issues.apache.org/jira/browse/ARROW-3106). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>

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[Website] Update committers and PMC roster on website #15780

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[Website] Update committers and PMC roster on website #15780

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