[5.1.x] Simplified GeoIP2._query() when passing IPv4Address()/IPv6Address() instances.

There is no need to call validate_ipv46_address() for
ipaddress.IPv4Address()/ipaddress.IPv6Address() instances since this
relies on trying to create these kind objects from strings, so they will
always be valid.

Backport of 0cabed9efa2c7abd1693860069f20ec5db41fcd8 from main.

django/contrib/gis/geoip2.py

@@ -153,6 +153,7 @@ class GeoIP2:
         if require_city and not self.is_city:
             raise GeoIP2Exception(f"Invalid GeoIP city data file: {self._path}")
 
+        if isinstance(query, str):
             try:
                 validate_ipv46_address(query)
             except ValidationError: