fix: include pptxgenjs in optimizeDeps

[kermanx]

My friend encountered this problem recently. I can't reproduce the problem, but this fix works well.

[pkg-pr-new]

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@slidev/client

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/client@2354

create-slidev

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev@2354

create-slidev-theme

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@2354

@slidev/parser

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/parser@2354

@slidev/cli

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/cli@2354

@slidev/types

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/types@2354

commit: fc1bb1f

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