v13.12.1

(googleplay) Fix #1434 - validProducts.find is not a product

Some user had this occasional error:

Error: TypeError: validProducts.find is not a function
    at http://localhost/:9909:64
    at Array.map (<anonymous>)
    at iabLoaded (http://localhost/:9908:46)
    at Object.callbackFromNative (http://localhost/:1708:52)
    at <anonymous>:1:9

This happened when another call to the native side was made before the list of products was returned (race condition kind of bug). It's fixed in that release.