chore(deps): update dependency core-js to v3.26.0

Author: renovate[bot]

package-lock.json

@@ -36,7 +36,7 @@
     "@edx/frontend-build": "12.3.0",
     "@edx/paragon": "20.18.0",
     "axios-mock-adapter": "1.21.2",
-    "core-js": "3.25.5",
+    "core-js": "3.26.0",
     "enzyme": "3.11.0",
     "enzyme-adapter-react-16": "1.15.6",
     "husky": "7.0.4",