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MINOR: [Dev] Remove maplefu as collaborator (#38397)

### Rationale for this change

@ mapleFU is committer now :tada: 

### What changes are included in this PR?

Remove from list of collaborators.

### Are these changes tested?

No

### Are there any user-facing changes?

No

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: mwish <maplewish117@gmail.com>