Update dependency leaflet to v1.9.4

Author: renovate[bot]

yarn.lock

@@ -13,9 +13,9 @@ leaflet.markercluster@~1:
   integrity sha512-ZSEpE/EFApR0bJ1w/dUGwTSUvWlpalKqIzkaYdYB7jaftQA/Y2Jav+eT4CMtEYFj+ZK4mswP13Q2acnPBnhGOw==
 
 leaflet@~1:
-  version "1.3.4"
-  resolved "https://registry.npmjs.org/leaflet/-/leaflet-1.3.4.tgz"
-  integrity sha512-FYL1LGFdj6v+2Ifpw+AcFIuIOqjNggfoLUwuwQv6+3sS21Za7Wvapq+LhbSE4NDXrEj6eYnW3y7LsaBICpyXtw==
+  version "1.9.4"
+  resolved "https://registry.yarnpkg.com/leaflet/-/leaflet-1.9.4.tgz#23fae724e282fa25745aff82ca4d394748db7d8d"
+  integrity sha512-nxS1ynzJOmOlHp+iL3FyWqK89GtNL8U8rvlMOsQdTTssxZwCXh8N2NB3GDQOL+YR3XnWyZAxwQixURb+FA74PA==
 
 underscore@~1.13.0:
   version "1.13.6"