fix(xsnap): update Moddable SDK to fix BigInt arithmetic #7866
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closes: #7864
Description
Cherry picks a Moddable SDK commit reverting a broken change that had made it into the 3.8.7 update.
Security Considerations
This solves a bad arithmetic issue that was forced on as an effect of #7830 (before that change we would have experienced a divergence between validators)
Scaling Considerations
None
Documentation Considerations
None
Testing Considerations
Re-ran acceptance tests (see #6929) replaying vat42 on gcc9, 10 and clang.
We do not currently have a unit test reproducing this but may be able to derive one later.