Update dependency core-js to v3.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
core-js	3.13.1 -> 3.15.1

---

Release Notes

zloirock/core-js

### [`v3.15.1`](https://togithub.com/zloirock/core-js/blob/master/CHANGELOG.md#​3151---20210623) [Compare Source](https://togithub.com/zloirock/core-js/compare/v3.15.0...v3.15.1) - Fixed cloning of regex through `RegExp` constructor, [#​948](https://togithub.com/zloirock/core-js/issues/948) ### [`v3.15.0`](https://togithub.com/zloirock/core-js/blob/master/CHANGELOG.md#​3150---20210621) [Compare Source](https://togithub.com/zloirock/core-js/compare/v3.14.0...v3.15.0) - Added `RegExp` named capture groups polyfill, [#​521](https://togithub.com/zloirock/core-js/issues/521), [#​944](https://togithub.com/zloirock/core-js/issues/944) - Added `RegExp` `dotAll` flag polyfill, [#​792](https://togithub.com/zloirock/core-js/issues/792), [#​944](https://togithub.com/zloirock/core-js/issues/944) - Added missed polyfills of [Annex B](https://tc39.es/ecma262/#sec-additional-built-in-properties) features (required mainly for some non-browser engines), [#​336](https://togithub.com/zloirock/core-js/issues/336), [#​945](https://togithub.com/zloirock/core-js/issues/945): - `escape` - `unescape` - `String.prototype.substr` - `Date.prototype.getYear` - `Date.prototype.setYear` - `Date.prototype.toGMTString` - Fixed detection of forbidden host code points in `URL` polyfill - Allowed `rhino` target in `core-js-compat` / `core-js-builder`, added compat data for `rhino` 1.7.13, [#​942](https://togithub.com/zloirock/core-js/issues/942), thanks [@​gausie](https://togithub.com/gausie) - `.at` marked as supported from FF90 ### [`v3.14.0`](https://togithub.com/zloirock/core-js/blob/master/CHANGELOG.md#​3140---20210605) [Compare Source](https://togithub.com/zloirock/core-js/compare/v3.13.1...v3.14.0) - Added polyfill of stable sort in `{ Array, %TypedArray% }.prototype.sort`, [#​769](https://togithub.com/zloirock/core-js/issues/769), [#​941](https://togithub.com/zloirock/core-js/issues/941) - Fixed `Safari` 14.0- `%TypedArray%.prototype.sort` validation of arguments bug - `.at` marked as supported from V8 9.2

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• [ ] If you want to rebase/retry this PR, check this box.

---

This PR has been generated by WhiteSource Renovate. View repository job log here.