build(deps): Bump log4js from 5.3.0 to 6.0.0 (#1845)

Bumps [log4js](https://github.com/log4js-node/log4js-node) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/log4js-node/log4js-node/releases)
- [Changelog](https://github.com/log4js-node/log4js-node/blob/master/CHANGELOG.md)
- [Commits](log4js-node/log4js-node@v5.3.0...v6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

packages/core/package.json

@@ -63,7 +63,7 @@
     "istanbul-lib-instrument": "~3.3.0",
     "lodash.flatmap": "^4.5.0",
     "lodash.groupby": "^4.6.0",
-    "log4js": "~5.3.0",
+    "log4js": "~6.0.0",
     "mkdirp": "~0.5.1",
     "mutation-testing-metrics": "^1.1.1",
     "progress": "~2.0.0",