chore(deps): update devdependency core-js to ^3.8.3

Author: renovate-bot

package.json

@@ -43,7 +43,7 @@
     "babel-jest": "^26.6.3",
     "babel-plugin-dynamic-import-node": "^2.3.3",
     "codecov": "latest",
-    "core-js": "^3.8.2",
+    "core-js": "^3.8.3",
     "cz-conventional-changelog": "latest",
     "eslint": "^7.18.0",
     "firebase": "^8.2.3",