fix: update dependency @types/leaflet to v1.9.21

Author: renovate[bot]

browser-extension/package-lock.json

@@ -11,7 +11,7 @@
   "devDependencies": {
     "@types/adm-zip": "0.5.8",
     "@types/chrome": "0.1.38",
-    "@types/leaflet": "1.9.5",
+    "@types/leaflet": "1.9.21",
     "adm-zip": "0.5.16",
     "esbuild": "0.27.4"
   },

browser-extension/package.json

@@ -29,7 +29,7 @@
     "@turf/length": "6.5.0",
     "@turf/nearest-point-on-line": "6.5.0",
     "@turf/union": "6.5.0",
-    "@types/leaflet": "1.9.5",
+    "@types/leaflet": "1.9.21",
     "@types/node": "22.19.15",
     "@types/object-hash": "3.0.6",
     "@types/react": "18.3.28",