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,