package.json: pin core-js-compat to 3.4.5
package.json: pin core-js-compat to 3.4.5

https://github.com/zloirock/core-js/issues/710

jkozol/welder-web,jkozol/welder-web,weldr/welder-web,weldr/welder-web,jkozol/welder-web,jkozol/welder-web,weldr/welder-web,weldr/welder-web