Bump express from 4.21.0 to 4.21.1 in the development-dependencies group

Bumps the development-dependencies group with 1 update: [express](https://github.com/expressjs/express).


Updates `express` from 4.21.0 to 4.21.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.21.0...4.21.1)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -16,7 +16,7 @@
     "chai": "^4.5.0",
     "dotcom-tool-kit": "^4.0.3",
     "eslint": "^8.57.1",
-    "express": "^4.21.0",
+    "express": "^4.21.1",
     "mitm": "^1.7.3",
     "mocha": "^10.7.3",
     "mockery": "^2.1.0",