fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AXIOS-6032459

package.json

@@ -17,11 +17,11 @@
     "build-tailwind": "npx postcss src/tailwind.css -o public/stylesheets/style.css"
   },
   "dependencies": {
-    "@sendgrid/mail": "^7.4.4",
+    "@sendgrid/mail": "^8.0.0",
     "app-root-path": "^3.0.0",
     "axios": "^0.21.3",
     "cookie-parser": "^1.4.5",
-    "express": "^4.19.2",
+    "express": "^4.17.1",
     "express-rate-limit": "^5.2.6",
     "hcaptcha": "^0.0.2",
     "helmet": "^4.6.0",