fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BODYPARSER-7926860
- https://snyk.io/vuln/SNYK-JS-EXPRESS-7926867
- https://snyk.io/vuln/SNYK-JS-SEND-7926862
- https://snyk.io/vuln/SNYK-JS-SERVESTATIC-7926865

Author: snyk-bot

package.json

@@ -29,11 +29,11 @@
     "node": ">=8.x"
   },
   "dependencies": {
-    "body-parser": "^1.19.0",
+    "body-parser": "^1.20.3",
     "cookie-parser": "~1.4.4",
     "debug": ">=4.1.1",
     "dotenv-safe": "^8.2.0",
-    "express": "^4.17.1",
+    "express": "^4.21.0",
     "lowdb": "^1.0.0",
     "morgan": "^1.9.1",
     "pug": "^2.0.4",