fix: package.json & yarn.lock 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

@@ -23,11 +23,11 @@
   "dependencies": {
     "@graphile/pg-pubsub": "^4.12.2",
     "ajv": "^8.11.0",
-    "body-parser": "^1.20.0",
+    "body-parser": "^1.20.3",
     "cors": "^2.8.5",
     "crypto": "^1.0.1",
     "dotenv": "^16.0.1",
-    "express": "^4.18.1",
+    "express": "^4.21.0",
     "express-jwt": "^8.0.0",
     "express-validator": "^6.14.2",
     "jwks-rsa": "^2.1.3",