chore(deps): bump proj4 from 2.9.0 to 2.9.2 in /frontend (#60)

Bumps [proj4](https://github.com/proj4js/proj4js) from 2.9.0 to 2.9.2.
- [Release notes](https://github.com/proj4js/proj4js/releases)
- [Changelog](https://github.com/proj4js/proj4js/blob/master/changelog.md)
- [Commits](proj4js/proj4js@2.9.0...2.9.2)

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

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

frontend/package.json

@@ -14,7 +14,7 @@
     "chart.js": "^4.1.1",
     "d3": "^7.8.5",
     "leaflet.markercluster": "^1.5.3",
-    "proj4": "^2.9.0",
+    "proj4": "^2.9.2",
     "proj4leaflet": "^1.0.2",
     "vue": "^3.3.8",
     "vue-chartjs": "^5.2.0",