Bump leaflet from 1.5.1 to 1.9.3

Newer versions have more capabilities and also fix lot of errors,
usability and accessibility issues.

Note that we're using an external gem to rails-assets.org as it's
not supports the rails-assets pipeline. This gems wraps the
original one and make the code work with the default rails assets
pipeline as usual.

Gemfile

@@ -36,6 +36,7 @@ gem "jquery-fileupload-rails"
 gem "jquery-rails", "~> 4.5.0"
 gem "jquery-ui-rails", "~> 6.0.1"
 gem "kaminari", "~> 1.2.2"
+gem "leaflet-rails", "~> 1.9.3"
 gem "mini_magick", "~> 4.11.0"
 gem "omniauth", "~> 2.1.0"
 gem "omniauth-facebook", "~> 9.0.0"
@@ -66,7 +67,6 @@ gem "wicked_pdf", "~> 2.6.3"
 gem "wkhtmltopdf-binary", "~> 0.12.6"
 
 source "https://rails-assets.org" do
-  gem "rails-assets-leaflet"
   gem "rails-assets-markdown-it", "~> 9.0.1"
 end
 

Gemfile.lock

@@ -1,7 +1,6 @@
 GEM
   remote: https://rails-assets.org/
   specs:
-    rails-assets-leaflet (1.5.1)
     rails-assets-markdown-it (9.0.1)
 
 GEM
@@ -327,6 +326,8 @@ GEM
       kramdown (~> 2.0)
     launchy (2.5.0)
       addressable (~> 2.7)
+    leaflet-rails (1.9.3)
+      rails (>= 4.2.0)
     letter_opener (1.8.1)
       launchy (>= 2.2, < 3)
     letter_opener_web (2.0.0)
@@ -717,6 +718,7 @@ DEPENDENCIES
   kaminari (~> 1.2.2)
   knapsack_pro (~> 3.3.1)
   launchy (~> 2.5.0)
+  leaflet-rails (~> 1.9.3)
   letter_opener_web (~> 2.0.0)
   mdl (~> 0.11.0)
   mini_magick (~> 4.11.0)
@@ -735,7 +737,6 @@ DEPENDENCIES
   pronto-scss (~> 0.11.0)
   puma (~> 4.3.12)
   rails (= 6.0.6.1)
-  rails-assets-leaflet!
   rails-assets-markdown-it (~> 9.0.1)!
   recipient_interceptor (~> 0.3.1)
   redcarpet (~> 3.5.1)