chore: bump bk-emulator digest to 31af5ca

This MR contains the following updates:

Package	Update	Change
bk-emulator	digest	cf70ce5 -> 31af5ca

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🗒Changelog
Compare revision cf70ce503ddb65051a58f3c4f61d1e258fc4c84b to 31af5ca5f307991eb596ed411d4d0e955c833421

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