Work around a test failure in Py3.10.

Closes https://github.com/cython/cython/pull/4101
See https://github.com/cython/cython/issues/4100

tests/run/test_unicode.pyx

@@ -1470,19 +1470,19 @@ class UnicodeTest(CommonTest,
         class Str(str, enum.Enum):
             ABC = 'abc'
         # Testing Unicode formatting strings...
-        self.assertEqual("%s, %s" % (Str.ABC, Str.ABC),
-                         'Str.ABC, Str.ABC')
-        self.assertEqual("%s, %s, %d, %i, %u, %f, %5.2f" %
+        self.assertEqual(("%s, %s" % (Str.ABC, Str.ABC)).replace("Str.", ""),
+                         'ABC, ABC')
+        self.assertEqual(("%s, %s, %d, %i, %u, %f, %5.2f" %
                         (Str.ABC, Str.ABC,
                          Int.IDES, Int.IDES, Int.IDES,
-                         Float.PI, Float.PI),
-                         'Str.ABC, Str.ABC, 15, 15, 15, 3.141593,  3.14')
+                         Float.PI, Float.PI)).replace("Str.", ""),
+                         'ABC, ABC, 15, 15, 15, 3.141593,  3.14')
 
         # formatting jobs delegated from the string implementation:
-        self.assertEqual('...%(foo)s...' % {'foo':Str.ABC},
-                         '...Str.ABC...')
-        self.assertEqual('...%(foo)s...' % {'foo':Int.IDES},
-                         '...Int.IDES...')
+        self.assertEqual(('...%(foo)s...' % {'foo':Str.ABC}).replace("Str.", ""),
+                         '...ABC...')
+        self.assertEqual(('...%(foo)s...' % {'foo':Int.IDES}).replace("Int.", ""),
+                         '...IDES...')
         self.assertEqual('...%(foo)i...' % {'foo':Int.IDES},
                          '...15...')
         self.assertEqual('...%(foo)d...' % {'foo':Int.IDES},