Bump @types/node from 10.17.60 to 20.8.6 in /packages/prerender-proxy

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 10.17.60 to 20.8.6.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

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

packages/prerender-proxy/package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "@aws-cdk/assert": "1.180.0",
     "@types/jest": "^26.0.21",
-    "@types/node": "^10.17.60",
+    "@types/node": "^20.8.6",
     "jest": "^26.4.2",
     "ts-jest": "^26.5.4",
     "ts-node": "^10.0.0",