Bump @types/serve-static from 1.15.7 to 1.15.9

Bumps [@types/serve-static](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/serve-static) from 1.15.7 to 1.15.9.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/serve-static)

---
updated-dependencies:
- dependency-name: "@types/serve-static"
  dependency-version: 1.15.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "@types/finalhandler": "^1.1.0",
     "@types/jest": "^26.0.19",
     "@types/node": "^14.14.14",
-    "@types/serve-static": "^1.15.7",
+    "@types/serve-static": "^1.15.9",
     "@types/ws": "^8.18.1",
     "jest": "^29.7.0",
     "typescript": "^4.1.5"