Bump express and @types/express in /backup

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 5.1.0
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.21.2...v5.1.0)

Updates `@types/express` from 5.0.0 to 5.0.1
- [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: 5.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/express"
  dependency-version: 5.0.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backup/package.json

@@ -6,12 +6,12 @@
   "dependencies": {
     "@google-cloud/storage": "^7.16.0",
     "age-encryption": "^0.2.1",
-    "express": "^4.21.2",
+    "express": "^5.1.0",
     "morgan": "^1.10.0"
   },
   "devDependencies": {
     "@tsconfig/node22": "^22.0.1",
-    "@types/express": "^5.0.0",
+    "@types/express": "^5.0.1",
     "@types/morgan": "^1.9.9",
     "@types/node": "^22.15.2",
     "typescript": "^5.8.3"