Update js client path for dependabot (#3264)

Summary:
This has been failing since the move in D31688105 (9a47f41056).

Pull Request resolved: https://github.com/facebook/flipper/pull/3264

Test Plan: _eyes_

Reviewed By: antonk52

Differential Revision: D33509970

Pulled By: passy

fbshipit-source-id: 5cb49cc96fe7d74fa9a1820a99daf79641f25837

.github/dependabot.yml

@@ -15,7 +15,7 @@ updates:
       update-types: ["version-update:semver-major"]
     - dependency-name: "@types/*"
 - package-ecosystem: npm
-  directory: "/flipper-js-client-sdk"
+  directory: "/js/js-flipper"
   schedule:
     interval: weekly
     time: '13:00'