chore(deps): update dependency is-promise to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
is-promise	dependencies	major	^3.0.0 -> ^4.0.0

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Release Notes

then/is-promise

v4.0.0

Compare Source

Breaking Changes

• Use PromiseLike instead of Promise in TypeScript (#​40)

  This is only a breaking change for TypeScript users.

  In the following code:

  function foo(x: PromiseLike`string> | string) {
    if (isPromise(x)) {
      return x;
    } else {
      return Promise.resolve(x);
    }
  }

  TypeScript would previously have incorrectly inferred foo as returning Promisestring>when in fact it returnsPromiseLikestring>. The latest version fixes this. If you instead had the following code, it should work exactly the same as before:

  function foo(x: Promise`string> | string) {
    if (isPromise(x)) {
      return x;
    } else {
      return Promise.resolve(x);
    }
  }

  This update is to reflect the fact that is-promise does "duck" typing, rather than an instanceof check.

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