gh-92810: Revert unwanted changes from test_isinstance.py

Author: dolfinus

Lib/test/test_isinstance.py

@@ -317,6 +317,7 @@ def __bases__(self):
             self.assertRaises(RecursionError, issubclass, int, X())
             self.assertRaises(RecursionError, isinstance, 1, X())
 
+    @support.skip_if_unlimited_stack_size
     @support.skip_emscripten_stack_overflow()
     @support.skip_wasi_stack_overflow()
     def test_infinite_recursion_via_bases_tuple(self):
@@ -328,6 +329,7 @@ def __getattr__(self, attr):
             with self.assertRaises(RecursionError):
                 issubclass(Failure(), int)
 
+    @support.skip_if_unlimited_stack_size
     @support.skip_emscripten_stack_overflow()
     @support.skip_wasi_stack_overflow()
     def test_infinite_cycle_in_bases(self):