If the wheel is correctly dished and aligned in the first place it won't change when doing hub service, so there's no need to touch the spokes.
The spokes are on the shell which is unaffected and will be in the same place after service as it was before. The only time hub service would affect dish is when you respace the axle which would move the shell to one side or the other with respect to the axle's locknut faces.
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