Bump koa and @types/koa

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

Updates `koa` from 3.0.1 to 3.1.1
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](koajs/koa@v3.0.1...v3.1.1)

Updates `@types/koa` from 3.0.0 to 3.0.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/koa)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 3.1.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: "@types/koa"
  dependency-version: 3.0.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/altair-koa-middleware/package.json

@@ -10,12 +10,12 @@
   },
   "devDependencies": {
     "@types/jest": "^27.0.1",
-    "@types/koa": "^3.0.0",
+    "@types/koa": "^3.0.1",
     "@types/koa__router": "^12.0.4",
     "@types/node": "^22.7.4",
     "@types/supertest": "^6.0.2",
     "jest": "29.4.1",
-    "koa": "^3.0.1",
+    "koa": "^3.1.1",
     "nodemon": "^2.0.12",
     "supertest": "^7.0.0",
     "ts-jest": "29.0.5",