chore(deps-dev): bump core-js from 3.11.2 to 3.12.0 (bootstrap-vue#6600)

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.11.2 to 3.12.0.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/commits/v3.12.0/packages/core-js)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -110,7 +110,7 @@
     "clean-css-cli": "^4.3.0",
     "codemirror": "^5.61.0",
     "codesandbox": "^2.2.3",
-    "core-js": "^3.11.2",
+    "core-js": "^3.12.0",
     "cross-env": "^7.0.3",
     "eslint": "^7.25.0",
     "eslint-config-prettier": "^8.3.0",

yarn.lock

@@ -4437,10 +4437,10 @@ core-js@^2.4.0, core-js@^2.6.5:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.12.tgz#d9333dfa7b065e347cc5682219d6f690859cc2ec"
   integrity sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==
 
-core-js@^3.11.2:
-  version "3.11.2"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.11.2.tgz#af087a43373fc6e72942917c4a4c3de43ed574d6"
-  integrity sha512-3tfrrO1JpJSYGKnd9LKTBPqgUES/UYiCzMKeqwR1+jF16q4kD1BY2NvqkfuzXwQ6+CIWm55V9cjD7PQd+hijdw==
+core-js@^3.12.0:
+  version "3.12.0"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.12.0.tgz#62bac86f7d7f087d40dba3e90a211c2c3c8559ea"
+  integrity sha512-SaMnchL//WwU2Ot1hhkPflE8gzo7uq1FGvUJ8GKmi3TOU7rGTHIU+eir1WGf6qOtTyxdfdcp10yPdGZ59sQ3hw==
 
 [email protected], core-util-is@~1.0.0:
   version "1.0.2"