build: rolled back to tsup 6.6.0 to avoid this issue

[field123]

Describe your changes

• rolled back tsup to version 6.6.0 to avoid this issue in ci tsup build failing with ERR_WORKER_OUT_OF_MEMORY egoist/tsup#920 it was causing a heap overflow

Issue ticket number and link

n/a

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• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
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Latest commit: 524bfad

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