Bump log4js from 6.8.0 to 6.9.0

Bumps [log4js](https://github.com/log4js-node/log4js-node) from 6.8.0 to 6.9.0.
- [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@v6.8.0...v6.9.0)

---
updated-dependencies:
- dependency-name: log4js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -9,7 +9,7 @@
     "README.md"
   ],
   "dependencies": {
-    "log4js": "^6.8.0"
+    "log4js": "^6.9.0"
   },
   "scripts": {
     "build": "tsc",