fix: type error due to customTesters in context but not in state

[justin-tay]

Fixes #9

I think this should minimally be compatible from expect 27.5.1 which I see is used in package-lock.json.

The calling code to the matcher is

        asymmetricMatch(other) {
          const {pass} = matcher.call(
            this.getMatcherContext(),
            other,
            ...this.sample
          );
          return this.inverse ? !pass : pass;
        }

that is in jestMatchersObject in expect.

[debugmaster]

I have upgraded the project to consume Jest 29.4. The mistake is clear in the new types.

expect.getState() returns MatcherState, but matchers require MatcherContext = MatchersState & MatcherUtils to be fully defined.