Change the location of the FIRST cutout server

The old third server is no longer supported and has practically stopped
working.  This configuration change gives the new URL for the server.

Note this change does not happen often -- the URL has been the same
since 1997 before this change!

Author: rlwastro

astroquery/image_cutouts/first/__init__.py

@@ -17,7 +17,7 @@ class Conf(_config.ConfigNamespace):
     Configuration parameters for `astroquery.image_cutouts.first`.
     """
     server = _config.ConfigItem(
-        ['https://third.ucllnl.org/cgi-bin/firstcutout'],
+        ['https://sundog.stsci.edu/cgi-bin/firstcutout'],
         'Name of the FIRST server.')
     timeout = _config.ConfigItem(
         60,