fix(deps): bump proj4 from 2.8.0 to 2.8.1 (#711)

Bumps [proj4](https://github.com/proj4js/proj4js) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/proj4js/proj4js/releases)
- [Changelog](https://github.com/proj4js/proj4js/blob/master/changelog.md)
- [Commits](https://github.com/proj4js/proj4js/compare/2.8.0...2.8.1)

---
updated-dependencies:
- dependency-name: proj4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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package.json

@@ -37,7 +37,7 @@
     "http-shutdown": "1.2.2",
     "morgan": "1.10.0",
     "pbf": "3.2.1",
-    "proj4": "2.8.0",
+    "proj4": "2.8.1",
     "request": "2.88.2",
     "sanitize-filename": "1.6.3",
     "sharp": "0.31.3",