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MINOR: [Dev] Remove current committer from collaborators list (#45256)

### Rationale for this change

Laurent Goujon became a committer on November. No requirement to be specified as collaborator anymore. Announcement here: https://lists.apache.org/thread/jj7z0hvjbr6y2m4xjwv78s9ptvbhsc78

### What changes are included in this PR?

Remove laurentgo from list of collaborators as is a committer now.

### Are these changes tested?

No

### Are there any user-facing changes?
No

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>