Bump @types/leaflet from 1.9.14 to 1.9.15

Bumps [@types/leaflet](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/leaflet) from 1.9.14 to 1.9.15.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/leaflet)

---
updated-dependencies:
- dependency-name: "@types/leaflet"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -26,7 +26,7 @@
     "@types/express": "^5.0.0",
     "@types/geojson": "^7946.0.14",
     "@types/jest": "^29.5.14",
-    "@types/leaflet": "^1.9.14",
+    "@types/leaflet": "^1.9.15",
     "@types/node": "^22.10.1",
     "@types/papaparse": "^5.3.15",
     "@typescript-eslint/eslint-plugin": "^8.16.0",