fix: course-04/exercises/lesson-5/solution/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-6139239

Author: snyk-bot

course-04/exercises/lesson-5/solution/package.json

@@ -7,7 +7,7 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "dependencies": {
-    "elasticsearch": "^15.5.0",
+    "elasticsearch": "^16.7.3",
     "http-aws-es": "^6.0.0",
     "jimp": "^0.6.4",
     "jsonwebtoken": "^8.5.1",