chore(deps-dev): bump @turf/helpers in /packages/winnow (koopjs#1054)

Bumps [@turf/helpers](https://github.com/Turfjs/turf) from 6.5.0 to 7.0.0.
- [Release notes](https://github.com/Turfjs/turf/releases)
- [Changelog](https://github.com/Turfjs/turf/blob/master/CHANGELOG.md)
- [Commits](Turfjs/turf@v6.5.0...v7.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Rich Gwozdz <rgwozdz@esri.com>

packages/winnow/package.json

@@ -69,7 +69,7 @@
     "wkt-parser": "^1.3.3"
   },
   "devDependencies": {
-    "@turf/helpers": "^6.5.0",
+    "@turf/helpers": "^7.0.0",
     "benchmark": "^2.1.4",
     "fs-extra": "^11.2.0",
     "proxyquire": "^2.1.3",