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

package.json

@@ -39,10 +39,10 @@
     "auth0-extension-express-tools": "^1.1.9",
     "auth0-extension-tools": "^1.3.3",
     "auth0-oauth2-express": "1.2.0",
-    "body-parser": "^1.15.2",
+    "body-parser": "^1.20.3",
     "cors": "2.8.1",
     "crypto": "^0.0.3",
-    "express": "4.14.0",
+    "express": "4.21.0",
     "express-jwt": "^5.1.0",
     "handlebars": "^4.0.5",
     "jsonwebtoken": "^7.1.9",