Remove **kwargs from NoConvergence

This is a follow-up to f9f5087 (Make
some kwargs-arguments named keyword-only arguments).

astropy/wcs/wcs.py

@@ -245,7 +245,6 @@ def __init__(
         niter=None,
         divergent=None,
         slow_conv=None,
-        **kwargs,
     ):
         super().__init__(*args)
 
@@ -255,14 +254,6 @@ def __init__(
         self.divergent = divergent
         self.slow_conv = slow_conv
 
-        if kwargs:
-            warnings.warn(
-                f"Function received unexpected arguments ({list(kwargs)}) these "
-                "are ignored but will raise an Exception in the "
-                "future.",
-                AstropyDeprecationWarning,
-            )
-
 
 class FITSFixedWarning(AstropyWarning):
     """