Update dependency core-js to v2.6.12

Author: supply-chain-sentinel[bot]

yarn.lock

@@ -1589,8 +1589,9 @@ copy-webpack-plugin@4.6.0:
     serialize-javascript "^1.4.0"
 
 core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.4:
-  version "2.6.5"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
+  version "2.6.12"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.12.tgz#d9333dfa7b065e347cc5682219d6f690859cc2ec"
+  integrity sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==
 
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"