VARINT->BIGNUM rename was a breaking change.

[michaelwallabi]

Guessing was intentional but I didn't see it called out anywhere so figured I'd mention in case others run into it.

The upgrade to 1.4 renamed the VARINT type to BIGNUM (I assume to match native C naming conventions).

This is a build break for anyone using the old name in code. Easy fix as they appear to be synonyms.

[jraymakers]

Yes, this breaking change was inherited from the corresponding breaking change to the DuckDB C API. I don't like making breaking changes, but luckily this one has a straightforward fix.