Upgrade Leaflet 1.6.0 -> 1.9.3, set default font size (#1660)

* upgrade folium 1.6.0 -> 1.9.3

* don't spell check notebooks (for now)

* Execute all notebooks

* Set reasonable font size

* Revert "Execute all notebooks"

This reverts commit 819c6e7.

* Revert "don't spell check notebooks (for now)"

This reverts commit d86adbe.

folium/folium.py

@@ -24,7 +24,7 @@
 
 
 _default_js = [
-    ("leaflet", "https://cdn.jsdelivr.net/npm/leaflet@1.6.0/dist/leaflet.js"),
+    ("leaflet", "https://cdn.jsdelivr.net/npm/leaflet@1.9.3/dist/leaflet.js"),
     ("jquery", "https://code.jquery.com/jquery-1.12.4.min.js"),
     (
         "bootstrap",
@@ -37,7 +37,7 @@
 ]
 
 _default_css = [
-    ("leaflet_css", "https://cdn.jsdelivr.net/npm/leaflet@1.6.0/dist/leaflet.css"),
+    ("leaflet_css", "https://cdn.jsdelivr.net/npm/leaflet@1.9.3/dist/leaflet.css"),
     (
         "bootstrap_css",
         "https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css",
@@ -190,6 +190,7 @@ class Map(JSCSSMixin, MacroElement):
                     left: {{this.left[0]}}{{this.left[1]}};
                     top: {{this.top[0]}}{{this.top[1]}};
                 }
+                .leaflet-container { font-size: 1rem; }
             </style>
         {% endmacro %}