[3.12] gh-121804: Backport idlelib.pyshell change (GH-121886) (#123366)

To aid future backports here.

Author: terryjreedy

Lib/idlelib/pyshell.py

@@ -706,7 +706,7 @@ def prepend_syspath(self, filename):
             del _filename, _sys, _dirname, _dir
             \n""".format(filename))
 
-    def showsyntaxerror(self, filename=None):
+    def showsyntaxerror(self, filename=None, **kwargs):
         """Override Interactive Interpreter method: Use Colorizing
 
         Color the offending position instead of printing it and pointing at it