fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-CACHEBASE-1054631

Author: snyk-bot

package.json

@@ -69,7 +69,7 @@
     "ts-jest": "^24.1.0",
     "ts-loader": "^6.1.0",
     "typescript": "^3.6.3",
-    "webpack": "^4.17.2",
+    "webpack": "^5.0.0",
     "webpack-command": "^0.4.1"
   },
   "dependencies": {