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MINOR: Remove inactive contributors (#43177)

### What changes are included in this PR?

This list has a hardcoded limit of 10 entries. Audit the list for inactivity to avoid prematurely hitting the limit.

### Are these changes tested?

n/a

### Are there any user-facing changes?

No

Authored-by: Dane Pitkin <dpitkin@apache.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>