Change Map lat&lon bound type annotations from int to float (#1954)

There is no technical reason for why the lat&lon bounds would have to be int.
In fact, it makes a lot of sense to use floats in order to allow for much more precise map bounds.

folium/folium.py

@@ -249,10 +249,10 @@ def __init__(
         min_zoom: Optional[int] = None,
         max_zoom: Optional[int] = None,
         zoom_start: int = 10,
-        min_lat: int = -90,
-        max_lat: int = 90,
-        min_lon: int = -180,
-        max_lon: int = 180,
+        min_lat: float = -90,
+        max_lat: float = 90,
+        min_lon: float = -180,
+        max_lon: float = 180,
         max_bounds: bool = False,
         crs: str = "EPSG3857",
         control_scale: bool = False,