⬆️ Bump express and @types/express

Bumps [express](https://github.com/expressjs/express) and [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express). These dependencies needed to be updated together.

Updates `express` from 4.21.2 to 5.2.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.21.2...v5.2.1)

Updates `@types/express` from 4.17.21 to 5.0.6
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.2.1
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: "@types/express"
  dependency-version: 5.0.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -19,7 +19,7 @@
   },
   "peerDependencies": {
     "body-parser": "1.20.3",
-    "express": "4.21.2",
+    "express": "5.2.1",
     "node-fetch": "2.6.11",
     "safe-compare": "1.1.4"
   },
@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "@types/common-tags": "^1.8.0",
-    "@types/express": "4.17.21",
+    "@types/express": "5.0.6",
     "@types/jest": "^30.0.0",
     "@types/node": "^24.0.1",
     "@types/node-fetch": "^2.6.4",
@@ -53,7 +53,7 @@
     "eslint-config-amo": "^6.1.0",
     "eslint-import-resolver-typescript": "^4.4.4",
     "eslint-plugin-amo": "^2.0.0",
-    "express": "4.21.2",
+    "express": "5.2.1",
     "jest": "^30.2.0",
     "node-fetch": "2.6.11",
     "prettier": "3.7.4",