chore(deps): update proj4 requirement in /packages/winnow

Updates the requirements on [proj4](https://github.com/proj4js/proj4js) to permit the latest version.
- [Release notes](https://github.com/proj4js/proj4js/releases)
- [Changelog](https://github.com/proj4js/proj4js/blob/master/changelog.md)
- [Commits](proj4js/proj4js@2.12.0...v2.12.1)

---
updated-dependencies:
- dependency-name: proj4
  dependency-type: direct:production
...

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

packages/winnow/package.json

@@ -64,7 +64,7 @@
     "moment": "^2.30.1",
     "murmurhash": "^2.0.1",
     "ngeohash": "^0.6.3",
-    "proj4": "^2.12.0",
+    "proj4": "^2.12.1",
     "simple-statistics": "^7.8.5",
     "wkt-parser": "^1.3.3"
   },