Fix types for TypeScript 5.4

[gabritto]

Compiling the file types/index.d.ts with version 5.4 of TypeScript (currently nightly) produces the following errors:

knex/types/index.d.ts(1241,50): error TS2344: Type 'ResolveTableType<TRecord, "base">' does not satisfy the constraint '{}'.
  Type 'unknown' is not assignable to type '{}'.
knex/types/index.d.ts(1256,50): error TS2344: Type 'ResolveTableType<TRecord, "base">' does not satisfy the constraint '{}'.

This was caused by this change.

This PR fixes these errors.

[kibertoad]

@gabritto CI for types is failing, could you please take a look?

[coveralls]

coverage: 92.778%. remained the same
when pulling bf01fbf on gabritto:fix-5.4
into 1d7707e on knex:master.

[kibertoad]

Thanks a lot!

[gabritto]

@kibertoad what's the release schedule for knex? I'd like to know when there will be a release with the new index.d.ts, just so I know when I can remove it from the expected list of failures we have over on DefinitelyTyped.

[kibertoad]

@gabritto I can probably cut a new one right now!

[kibertoad]

Released in 3.1.0