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MINOR: [CI] update weston codeowners (#39867)

### Rationale for this change

Currently I am unable to keep up with my Github inbox and thus respond to very little.  I am trying to balance this.

### What changes are included in this PR?

Reduce the scope of files that will trigger automated review.

### Are these changes tested?

N/A

### Are there any user-facing changes?

No

Authored-by: Weston Pace <weston.pace@gmail.com>
Signed-off-by: Weston Pace <weston.pace@gmail.com>